Hudbay Announces Positive Preliminary Economic Assessment for its Mason Copper Project

27-year mine life with average annual copper production of approximately 140,000 tonnes over the first ten years of full production.
Mason has the potential to more than double Hudbay’s current copper production levels, and if brought into production, Mason is expected to become the third largest copper mine in the United States.
After-tax net present value (10%) of $519 million and 13.7% internal rate of return at $3.10 per pound copper, which increases to $773 million and 15.4%, respectively, at $3.25 per pound copper.
Mine plan assumes the construction of a 120,000 tonnes per day conventional flotation concentrator and an initial capital cost estimate of approximately $2.1 billion.
The mine plan includes 1.1 billion tonnes at 0.34% copper-equivalentⁱ, 98% of which is from the measured and indicated categories.
Mason’s 2.2 billion tonne measured and indicated resource estimate is one of the largest greenfield copper projects in the Americas.
Opportunities to further enhance project economics through exploration for higher-grade satellite deposits on Hudbay’s prospective land package in Nevada.
Mason is a viable long-term option for potential future development and a strong component of Hudbay’s pipeline of long-term growth opportunities in mining friendly jurisdictions.

Hudbay Minerals Inc. (TSX:HBM) (NYSE: HBM) announced the results of its preliminary economic assessment of its 100%-owned Mason copper project located in Nevada, United States. All dollar amounts are in US dollars, unless otherwise noted.

“The Mason PEA demonstrates the success of Hudbay’s consistent growth strategy and our team’s ability to create value from accretive acquisitions of high-quality copper projects in mining-friendly jurisdictions,” said Peter Kukielski, Hudbay’s President and Chief Executive Officer. “We added Mason to our development pipeline portfolio in 2018 and have since leveraged our integrated core competencies of exploration, mine planning and project development to demonstrate that Mason is a quality long-term development project in our robust organic growth pipeline.”

Hudbay’s Mason Development Strategy

The Mason project is a large greenfield copper deposit located in the historic Yerington District of Nevada and is one of the largest undeveloped copper porphyry deposits in North America. Mason’s measured and indicated mineral resource estimates are approximately twice the size of Hudbay’s Constancia and Rosemont deposits. Hudbay views the Mason project as a long-term option for future development and a strong component of its pipeline of long-term growth opportunities in mining friendly jurisdictions. Please refer to Figure 1 for a map showing the location of the Mason project.

In 2017, Hudbay made a $2 million toe-hold equity investment in Mason Resources Corp., the entity that owned the Mason project at that time. In October 2018, Hudbay entered into an agreement to acquire the remaining 86% of the issued and outstanding common shares of Mason Resources Corp. that it didn’t already own for approximately $15 million. The acquisition of Mason was completed by way of a plan of arrangement in December 2018. Since acquiring Mason, Hudbay has consolidated a prospective package of patented and unpatented mining claims contiguous to the Mason project in two private transactions in 2019 and 2020, including a property called Mason Valley, as shown in Figure 2. In March 2021, Hudbay announced an updated measured and indicated resource estimate of 2.2 billion tonnes at 0.29% copper at Mason, based on a revised resource model and an updated mine plan constructed by Hudbay personnel using the same methods applied at Constancia. The company has also advanced a number of technical studies to support the completion of its 2021 PEA.

Mason 2021 PEA Summary

The 2021 Mason PEA contemplates a 27-year mine life with average annual copper production of approximately 140,000 tonnes over the first ten years of full production. At a copper price of $3.10 per pound, the after-tax net present value using a 10% discount rate is $519 million and the internal rate of return is 13.7%. The valuation metrics are highly sensitive to the copper price and at a price of $3.25 per pound, the after-tax net present value using a 10% discount rate increases to $773 million and the internal rate of return increases to 15.4%.

A summary of key valuation, production and cost details from the 2021 PEA can be found below. For further details, including metrics provided on an annual basis, please refer to the section titled “Detailed Cash Flow Model” at the end of this news release.

Summary of Key Metrics (at $3.10/lb Cu)	Unit	Value
Valuation Metrics (Unlevered)¹
Net present value @ 8% (after-tax)	$ millions	$945
Net present value @ 10% (after-tax)	$ millions	$519
Internal rate of return (after-tax)	%	13.7%
Payback period	# years	9.0
EBITDA (annual LOM avg.)	$ millions	$339
Project Metrics
Initial capital²	$ millions	$2,079
Operating Metrics
Copper production (annual avg. over first 10 full years)	000 tonnes	138.7
Copper production (annual LOM avg.)	000 tonnes	112.3
Copper recovery	%	90.0%
Sustaining capital (annual LOM avg.)	$ millions	$21
Cash cost³ (LOM avg.)	$/lb Cu	$1.61
Sustaining cash cost³ (LOM avg.)	$/lb Cu	$1.76
Mining unit cost⁴(LOM avg.)	$/t moved	$1.20
Milling unit cost (LOM avg.)	$/t milled	$4.85
G&A unit cost (LOM avg.)	$/t milled	$1.15
Combined unit cost⁵(LOM avg.)	$/t milled	$8.66

Note: “LOM” refers to life-of-mine total.

¹ Calculated assuming the following commodity prices: copper price of $3.10 per pound, gold price of $1,500 per ounce, silver price of $18.00 per ounce and molybdenum price of $10.00 per pound.
² Initial capital assumes a 20% contingency.
³ Cash cost and sustaining cash cost, net of by-product credits, per pound of copper produced. By-product credits calculated using the following commodity prices: gold price of $1,500 per ounce, silver price of $18.00 per ounce and molybdenum price of $10.00 per pound. Sustaining cash cost includes sustaining capital expenditures and royalties. Cash cost and sustaining cash cost are non-IFRS financial performance measures with no standardized definition under IFRS. For further details on why Hudbay believes cash costs are a useful performance indicator, please refer to the company’s most recent Management’s Discussion and Analysis for the three and twelve months ended December 31, 2020.
⁴ Before the impact of capitalized stripping.
⁵ Combined mine, mill and general and administrative costs per tonne of ore milled, after the impact of capitalized stripping.

Cu Price Sensitivity	Unit	$3.00/lb	$3.10/lb	$3.25/lb	$3.50/lb	$3.75/lb	$4.00/lb
Valuation Metrics
Net present value¹ @ 8%	$ millions	$739	$945	$1,253	$1,761	$2,264	$2,766
Net present value¹ @ 10%	$ millions	$350	$519	$773	$1,191	$1,606	$2,019
Internal rate of return¹	%	12.5%	13.7 %	15.4%	18.1%	20.7%	23.1%
Payback period	# years	9.5	9.0	8.4	7.7	7.1	6.7
EBITDA (annual LOM avg.)	$ millions	$315	$339	$374	$434	$493	$553

¹ Net present value and internal rate of return are shown on an after-tax basis.

Overview of Proposed Operation

The Mason deposit is a large tonnage, copper-molybdenum deposit and is planned to be a traditional open pit shovel/truck operation with a copper sulphide mineral processing plant producing commercial grade copper and molybdenum concentrate. The plant is designed to operate at a throughput rate of 120,000 tonnes per day. Please refer to Figure 3 for a map of the proposed site layout.

Mining operations in the pit are designed to be performed from 15 and 30-metre-high benches using large-scale mining equipment including 10 5/8-inch diameter rotary blast hole drills, 74 cubic-yard electric mining shovels, a 55 cubic-yard hydraulic shovel, a 37 cubic-yard front-end loader and 290-tonne capacity haul trucks. During the 27-year operation, the mine plan achieves peak mining rates until year 13, then reduces by about half of the original mining rate from year 14 to 20 as the strip ratio drops. The remaining seven years assumes the processing of rehandled ore from stockpiles.

The concentrator design consists of conventional crushing and milling, followed by rougher and cleaner froth flotation, and is a similar flowsheet to that used at Hudbay’s Constancia mine in Peru. The proposed site layout assumes the plant will be located to the northwest of the open pit, northeast of the waste rock facility and east of the tailings management facility. Haul trucks will dump ore at the primary crusher, which will feed the concentrator via overland conveyor.

Operating costs were developed by Hudbay based on a bottom-up approach utilizing price quotes from suppliers and local costs for labour. Mine operating costs were validated against actual costs at Constancia and other similar projects and operations.

Mineral Resource Estimate

The PEA and mine plan were based on a revised resource model which was used to publish Hudbay’s first compiled updated resource estimate for Mason. The resource model was constructed using the same methods Hudbay applied at Constancia. Based on this new model, including resource classification criteria calibrated on historical performance at Constancia, control of grade over-smoothing in the central zone of the deposit and the use of a lower cut-off grade, the measured and indicated resources increased to 2.2 billion tonnes at 0.29% copper, from 1.4 billion tonnes at 0.32% copper previously.

The current mineral resource estimates for Mason, based on the revised resource model as of January 1, 2021, are summarized below.

Mason Project Mineral Resource Estimates^1,2,3	Tonnes	Cu Grade (%)	Mo Grade (g/t)	Au Grade (g/t)	Ag Grade (g/t)
Measured	1,417,000,000	0.29	59	0.031	0.66
Indicated	801,000,000	0.30	80	0.025	0.57
Total Measured and Indicated	2,219,000,000	0.29	67	0.029	0.63
Inferred	237,000,000	0.24	78	0.033	0.73

Note: totals may not add up correctly due to rounding.

¹ Mineral resource estimates that are not mineral reserves do not have demonstrated economic viability. Mineral resource estimates do not include factors for mining recovery or dilution.
² Metal prices of $3.10 per pound copper, $10.00 per pound molybdenum, $1,500 per ounce gold, and $18.00 per ounce silver were used to estimate mineral resources.
³ Mineral resource estimates are reported as 20 metres by 20 metres by 15 meters blocks above cut-off using a minimum NSR per tonne of $6.25.

Regional Upside Potential

There is opportunity to further enhance the project economics through exploration for higher grade satellite deposits on Hudbay’s prospective land package in Nevada, including Mason Valley. The Mason Valley property hosts several historical underground copper mines that were in production in the early 1900s. Much of the Mason Valley property is located on Hudbay’s wholly owned private lands and contains highly prospective skarn mineralization. Mason Valley presents a similar opportunity to Hudbay’s Copper World property in Arizona, where the company has recently announced the discovery of four mineral deposits in a historical mining district. Historical drilling and production records from the past producing mines at Mason Valley indicate the mineralization is high grade and starts at or near surface (please refer to Figure 4). In 2015, Metal Bank Limited optioned the Mason Valley property and conducted a limited campaign of nine reverse circulation drillholes at the Bluestone prospect with the objective to define the extent of the high-grade copper mineralization. Two notable holes intersected 42 metres of 1.51% copper and 34 metres of 0.61% copper, both starting from surface.

The company also owns the Blue Hill copper oxide deposit located 1.5 kilometres northwest of the Mason deposit, which was not included in the 2021 PEA and may present an opportunity to add an oxide component to the Mason project design in the future.

Next Steps

Hudbay continues to compile and interpret historical data relating to its land package near Mason. Once this is done, the company expects to complete a geophysical survey to refine the exploration targets in preparation for a potential initial drilling campaign later this year. The company will also continue to advance its local stakeholder engagement program while advancing trade-off studies to support future pre-feasibility work on the project.

Non-IFRS Financial Performance Measures

Cash cost and sustaining cash cost per pound of copper produced are shown because the company believes they help investors and management assess the performance of its operations, including the margin generated by the operations and the company. Unit operating costs are shown because these measures are used by the company as a key performance indicator to assess the performance of its mining and processing operations. These measures do not have a meaning prescribed by IFRS and are therefore unlikely to be comparable to similar measures presented by other issuers. These measures should not be considered in isolation or as a substitute for measures prepared in accordance with IFRS and are not necessarily indicative of operating profit or cash flow from operations as determined under IFRS. Other companies may calculate these measures differently. For further details on these measures, please refer to page 53 of Hudbay’s management’s discussion and analysis for the year ended December 31, 2020 available on SEDAR at www.sedar.com.

Qualified Person and NI 43-101

The scientific and technical information contained in this news release related to the Mason project has been approved by Olivier Tavchandjian, P. Geo, Hudbay’s Vice-President, Exploration and Geology. Mr. Tavchandjian is a qualified person pursuant to NI 43 101. The company expects to voluntarily file a National Instrument 43-101 technical report on Mason in the coming months.

This preliminary economic assessment is preliminary in nature, includes inferred resources that are considered too speculative to have the economic considerations applied to them that would enable them to be categorized as mineral reserves and there is no certainty the preliminary economic assessment will be realized.

About Hudbay

Hudbay is a diversified mining company primarily producing copper concentrate (containing copper, gold and silver) and zinc metal. Directly and through its subsidiaries, Hudbay owns three polymetallic mines, four ore concentrators and a zinc production facility in northern Manitoba and Saskatchewan (Canada) and Cusco (Peru), and copper projects in Arizona and Nevada (United States). The company’s growth strategy is focused on the exploration, development, operation and optimization of properties it already controls, as well as other mineral assets it may acquire that fit its strategic criteria. Hudbay’s vision is to be a responsible, top-tier operator of long-life, low-cost mines in the Americas. Hudbay’s mission is to create sustainable value through the acquisition, development and operation of high-quality, long-life deposits with exploration potential in jurisdictions that support responsible mining, and to see the regions and communities in which the company operates benefit from its presence. The company is governed by the Canada Business Corporations Act and its shares are listed under the symbol “HBM” on the Toronto Stock Exchange, New York Stock Exchange and Bolsa de Valores de Lima. Further information about Hudbay can be found on www.hudbay.com.

Detailed Cash Flow Model

Mason Cash Flow Model	Unit	LOM	Y-03	Y-02	Y-01	Y01	Y02	Y03	Y04	Y05	Y06	Y07
Mining Activities
Ore mined	000 tonnes	1,133,427	–	–	–	41,929	45,929	60,172	64,130	57,167	56,756	53,605
Waste mined	000 tonnes	1,448,540	–	–	–	117,871	113,781	99,828	95,870	102,833	103,244	106,395
Rehandle	000 tonnes	301,531	–	–	–	200	290	–	–	–	–	–
Pre-strip – Ore mined	000 tonnes	3,012	–	–	3,012	–	–	–	–	–	–	–
Pre-strip – Waste mined	000 tonnes	116,988	–	–	116,988	–	–	–	–	–	–	–
Mineral moved	000 tonnes	3,003,498	–	–	120,000	160,000	160,000	160,000	160,000	160,000	160,000	160,000
Strip ratio excl. pre-strip	waste/ore	1.28	–	–	–	2.81	2.48	1.66	1.49	1.80	1.82	1.98
Mining rate	000 t/day	353	–	–	329	438	438	438	438	438	438	438
Unit cost	$/t moved	1.20	–	–	–	1.20	1.20	1.20	1.25	1.25	1.25	1.29
Milling Activities
Ore milled	000 tonnes	1,136,439	–	–	–	36,500	43,800	43,800	43,800	43,800	43,800	43,800
Headgrade – Cu	%	0.296%	–	–	–	0.310%	0.381%	0.356%	0.380%	0.367%	0.369%	0.364%
Headgrade – Mo	%	0.006%	–	–	–	0.006%	0.008%	0.005%	0.007%	0.003%	0.002%	0.003%
Headgrade – Au	g/tonne	0.032	–	–	–	0.013	0.026	0.024	0.027	0.042	0.029	0.025
Headgrade – Ag	g/tonne	0.667	–	–	–	0.381	0.516	0.527	0.659	0.826	0.590	0.597
Milling Rate	000 t/day	115	–	–	–	100	120	120	120	120	120	120
Unit cost	$/t milled	4.85	–	–	–	4.90	4.90	4.90	4.90	4.90	4.90	4.90
Concentrates Produced & Sold
Copper concentrate	000 tonnes	10,108	–	–	–	339	501	468	499	482	485	479
Contained metal – Cu	000 tonnes	3,033	–	–	–	102	150	140	150	145	145	144
Contained metal – Au	000 ounces	696	–	–	–	9	22	20	23	36	24	21
Contained metal – Ag	000 ounces	14,630	–	–	–	268	436	445	556	698	499	504
Payable metal – Cu	000 tonnes	2,926	–	–	–	98	145	135	145	140	140	139
Payable metal – Au	000 ounces	618	–	–	–	–	20	18	21	32	22	19
Payable metal – Ag	000 ounces	12,133	–	–	–	–	–	–	501	628	449	454
Moly concentrate	000 tonnes	64	–	–	–	2	3	2	3	1	1	1
Contained metal – Mo	000 tonnes	32	–	–	–	1	2	1	1	1	1	1
Payable metal – Mo	000 tonnes	31	–	–	–	1	2	1	1	1	1	1
Capital Costs
Project capital	$ millions	2,079	228	839	1,012	–	–	–	–	–	–	–
Sustaining capital	$ millions	541	–	–	–	29	34	34	34	34	29	29
Deferred stripping	$ millions	427	–	–	–	77	66	28	17	37	38	49
Total	$ millions	3,046	228	839	1,012	106	100	62	51	71	67	78
Operating Costs
Mining	$ millions	3,458	–	–	–	192	192	192	200	200	200	206
Deferred stripping	$ millions	(427)	–	–	–	(77)	(66)	(28)	(17)	(37)	(38)	(49)
Milling	$ millions	5,506	–	–	–	179	215	215	215	215	215	215
G&A	$ millions	1,272	–	–	–	46	55	55	55	55	55	55
Closure + surety bonds	$ millions	153	1	1	1	1	1	1	1	1	1	1
Total	$ millions	9,963	1	1	1	340	396	435	453	433	432	427
Cost Metrics
Cash cost	$/lb Cu prod.	1.61	–	–	–	1.81	1.40	1.65	1.56	1.52	1.58	1.59
Sustaining cash cost	$/lb Cu prod.	1.76	–	–	–	2.30	1.72	1.86	1.73	1.76	1.81	1.85
Combined unit cost	$/t milled	8.66	–	–	–	9.32	9.05	9.93	10.34	9.89	9.86	9.76
Cash Flow Summary
Gross revenue	$ millions	21,838	–	–	–	697	1,059	975	1,061	1,030	1,011	998
TC/RC	$ millions	(1,417)	–	–	–	(47)	(70)	(64)	(70)	(66)	(65)	(65)
Freight	$ millions	(1,320)	–	–	–	(44)	(65)	(61)	(65)	(63)	(63)	(62)
NSR royalty	$ millions	(76)	–	–	–	(2)	(4)	(3)	(4)	(4)	(4)	(3)
Operating costs	$ millions	(9,963)	(1)	(1)	(1)	(340)	(396)	(435)	(453)	(433)	(432)	(427)
Federal tax	$ millions	(576)	–	–	–	–	–	(2)	(2)	(5)	(16)	(15)
State tax	$ millions	(314)	–	–	–	–	–	(6)	(5)	(10)	(9)	(8)
WC changes	$ millions	0	37	100	28	(139)	(16)	6	(5)	2	1	2
Cash from operations	$ millions	8,173	36	99	27	123	507	409	458	451	423	419
Capital costs	$ millions	(3,046)	(228)	(839)	(1,012)	(106)	(100)	(62)	(51)	(71)	(67)	(78)
Unlevered free cash flow	$ millions	5,127	(192)	(740)	(984)	17	407	348	407	380	356	342

Mason Cash Flow Model	Unit	Y08	Y09	Y10	Y11	Y12	Y13	Y14	Y15	Y16	Y17	Y18
Mining Activities
Ore mined	000 tonnes	61,926	60,606	75,486	69,209	72,697	60,446	56,742	65,268	69,051	62,323	45,688
Waste mined	000 tonnes	98,074	99,394	84,514	90,791	87,303	99,554	94,242	44,732	6,993	746	103
Rehandle	000 tonnes	–	–	–	–	–	–	–	–	–	–	–
Pre-strip – Ore mined	000 tonnes	–	–	–	–	–	–	–	–	–	–	–
Pre-strip – Waste mined	000 tonnes	–	–	–	–	–	–	–	–	–	–	–
Mineral moved	000 tonnes	160,000	160,000	160,000	160,000	160,000	160,000	150,983	110,000	76,043	63,069	45,791
Strip ratio excl. pre-strip	waste/ore	1.58	1.64	1.12	1.31	1.20	1.65	1.66	0.69	0.10	0.01	0.00
Mining rate	000 t/day	438	438	438	438	438	438	414	301	208	173	125
Unit cost	$/t moved	1.29	1.29	1.29	1.31	1.32	1.30	1.37	1.41	1.43	1.44	1.39
Milling Activities
Ore milled	000 tonnes	43,800	43,800	43,800	43,800	43,800	43,800	43,800	43,800	43,800	43,800	43,800
Headgrade – Cu	%	0.336%	0.312%	0.314%	0.339%	0.357%	0.349%	0.319%	0.330%	0.329%	0.320%	0.285%
Headgrade – Mo	%	0.008%	0.003%	0.004%	0.004%	0.003%	0.006%	0.008%	0.008%	0.008%	0.009%	0.004%
Headgrade – Au	g/tonne	0.042	0.044	0.043	0.040	0.026	0.026	0.037	0.039	0.040	0.040	0.051
Headgrade – Ag	g/tonne	0.904	0.916	0.751	0.733	0.639	0.572	0.854	1.008	0.867	0.846	1.028
Milling Rate	000 t/day	120	120	120	120	120	120	120	120	120	120	120
Unit cost	$/t milled	4.90	4.90	4.90	4.90	4.90	4.90	4.90	4.90	4.90	4.90	4.90
Concentrates Produced & Sold
Copper concentrate	000 tonnes	442	410	412	445	469	459	419	433	432	420	374
Contained metal – Cu	000 tonnes	132	123	124	134	141	138	126	130	130	126	112
Contained metal – Au	000 ounces	35	37	36	34	22	22	31	33	34	34	43
Contained metal – Ag	000 ounces	764	774	634	619	540	483	721	852	733	715	869
Payable metal – Cu	000 tonnes	128	119	119	129	136	133	121	125	125	122	108
Payable metal – Au	000 ounces	32	33	33	30	20	20	28	30	30	31	39
Payable metal – Ag	000 ounces	688	696	571	557	486	435	649	767	660	644	782
Moly concentrate	000 tonnes	3	1	2	2	1	2	4	4	3	4	2
Contained metal – Mo	000 tonnes	2	1	1	1	1	1	2	2	2	2	1
Payable metal – Mo	000 tonnes	2	1	1	1	1	1	2	2	2	2	1
Capital Costs
Project capital	$ millions	–	–	–	–	–	–	–	–	–	–	–
Sustaining capital	$ millions	29	27	27	25	25	25	25	27	27	10	10
Deferred stripping	$ millions	25	28	–	3	–	29	30	–	–	–	–
Total	$ millions	54	55	27	28	25	54	55	27	27	10	10
Operating Costs
Mining	$ millions	207	206	206	210	211	209	207	155	109	91	64
Deferred stripping	$ millions	(25)	(28)	–	(3)	–	(29)	(30)	–	–	–	–
Milling	$ millions	215	215	215	215	215	215	215	215	215	215	215
G&A	$ millions	55	55	55	55	55	55	55	55	53	53	53
Closure + surety bonds	$ millions	1	1	1	1	1	1	1	1	1	1	1
Total	$ millions	453	448	477	478	481	450	448	426	377	359	332
Cost Metrics
Cash cost	$/lb Cu prod.	1.63	1.77	1.87	1.77	1.78	1.67	1.70	1.56	1.41	1.35	1.38
Sustaining cash cost	$/lb Cu prod.	1.83	1.98	1.98	1.87	1.87	1.86	1.91	1.67	1.51	1.39	1.43
Combined unit cost	$/t milled	10.35	10.23	10.88	10.91	10.98	10.27	10.22	9.72	8.61	8.20	7.58
Cash Flow Summary
Gross revenue	$ millions	971	889	892	958	982	974	921	955	949	932	832
TC/RC	$ millions	(63)	(56)	(57)	(61)	(64)	(64)	(60)	(62)	(61)	(61)	(52)
Freight	$ millions	(58)	(53)	(54)	(58)	(61)	(60)	(55)	(57)	(56)	(55)	(49)
NSR royalty	$ millions	(3)	(3)	(3)	(3)	(3)	(3)	(3)	(3)	(3)	(3)	(3)
Operating costs	$ millions	(453)	(448)	(477)	(478)	(481)	(450)	(448)	(426)	(377)	(359)	(332)
Federal tax	$ millions	(14)	(21)	(24)	(23)	(29)	(31)	(31)	(27)	(34)	(41)	(43)
State tax	$ millions	(7)	(11)	(13)	(12)	(15)	(16)	(17)	(15)	(18)	(21)	(21)
WC changes	$ millions	2	5	(0)	(4)	(1)	0	3	(10)	(8)	(5)	2
Cash from operations	$ millions	374	302	266	318	328	350	310	355	390	388	334
Capital costs	$ millions	(54)	(55)	(27)	(28)	(25)	(54)	(55)	(27)	(27)	(10)	(10)
Unlevered free cash flow	$ millions	321	246	239	289	303	296	255	328	363	378	324

Mason Cash Flow Model	Unit	Y19	Y20	Y21	Y22	Y23	Y24	Y25	Y26	Y27	Y28	Y29
Mining Activities
Ore mined	000 tonnes	43,800	10,498	–	–	–	–	–	–	–	–	–
Waste mined	000 tonnes	2,031	241	–	–	–	–	–	–	–	–	–
Rehandle	000 tonnes	–	33,302	43,800	43,800	43,800	43,800	43,800	43,800	4,939	–	–
Pre-strip – Ore mined	000 tonnes	–	–	–	–	–	–	–	–	–	–	–
Pre-strip – Waste mined	000 tonnes	–	–	–	–	–	–	–	–	–	–	–
Mineral moved	000 tonnes	45,831	44,041	43,800	43,800	43,800	43,800	43,800	43,800	4,939	–	–
Strip ratio excl. pre-strip	waste/ore	0.05	0.02	–	–	–	–	–	–	–	–	–
Mining rate	000 t/day	126	29	–	–	–	–	–	–	–	–	–
Unit cost	$/t moved	1.02	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50	–	–
Milling Activities
Ore milled	000 tonnes	43,800	43,800	43,800	43,800	43,800	43,800	43,800	43,800	4,939	–	–
Headgrade – Cu	%	0.282%	0.245%	0.217%	0.202%	0.190%	0.177%	0.161%	0.141%	0.117%	–	–
Headgrade – Mo	%	0.006%	0.007%	0.006%	0.006%	0.006%	0.006%	0.005%	0.004%	0.003%	–	–
Headgrade – Au	g/tonne	0.054	0.032	0.026	0.023	0.021	0.019	0.020	0.016	0.012	–	–
Headgrade – Ag	g/tonne	1.067	0.637	0.510	0.453	0.419	0.379	0.373	0.300	0.249	–	–
Milling Rate	000 t/day	120	120	120	120	120	120	120	120	14	–	–
Unit cost	$/t milled	4.90	4.70	4.70	4.70	4.70	4.70	4.70	4.70	4.70	–	–
Concentrates Produced & Sold
Copper concentrate	000 tonnes	370	322	285	265	249	232	212	185	17	–	–
Contained metal – Cu	000 tonnes	111	97	86	80	75	70	64	56	5	–	–
Contained metal – Au	000 ounces	46	27	22	19	18	16	17	13	1	–	–
Contained metal – Ag	000 ounces	901	538	431	383	354	321	315	253	24	–	–
Payable metal – Cu	000 tonnes	107	93	83	77	72	67	61	54	5	–	–
Payable metal – Au	000 ounces	41	24	20	17	16	15	15	12	1	–	–
Payable metal – Ag	000 ounces	811	484	387	345	319	288	283	228	21	–	–
Moly concentrate	000 tonnes	3	3	3	3	3	3	2	2	0	–	–
Contained metal – Mo	000 tonnes	1	1	1	1	1	1	1	1	0	–	–
Payable metal – Mo	000 tonnes	1	1	1	1	1	1	1	1	0	–	–
Capital Costs
Project capital	$ millions	–	–	–	–	–	–	–	–	–	–	–
Sustaining capital	$ millions	10	10	10	10	5	5	5	5	–	–	–
Deferred stripping	$ millions	–	–	–	–	–	–	–	–	–	–	–
Total	$ millions	10	10	10	10	5	5	5	5	–	–	–
Operating Costs
Mining	$ millions	47	22	22	22	22	22	22	22	2	–	–
Deferred stripping	$ millions	–	–	–	–	–	–	–	–	–	–	–
Milling	$ millions	215	206	206	206	206	206	206	206	23	–	–
G&A	$ millions	44	44	35	35	35	35	35	35	4	–	–
Closure + surety bonds	$ millions	1	1	1	1	1	1	1	1	41	41	40
Total	$ millions	306	273	264	264	264	264	264	264	71	41	40
Cost Metrics
Cash cost	$/lb Cu prod.	1.23	1.34	1.47	1.57	1.66	1.77	1.93	2.22	2.78	–	–
Sustaining cash cost	$/lb Cu prod.	1.28	1.40	1.54	1.64	1.70	1.82	1.97	2.27	2.79	–	–
Combined unit cost	$/t milled	6.99	6.23	6.02	6.02	6.02	6.02	6.02	6.02	6.22	–	–
Cash Flow Summary
Gross revenue	$ millions	838	714	629	586	552	515	472	410	38	–	–
TC/RC	$ millions	(53)	(46)	(41)	(38)	(36)	(34)	(31)	(27)	(2)	–	–
Freight	$ millions	(48)	(42)	(37)	(35)	(33)	(30)	(28)	(24)	(2)	–	–
NSR royalty	$ millions	(3)	(3)	(2)	(2)	(2)	(2)	(2)	(1)	(0)	–	–
Operating costs	$ millions	(306)	(273)	(264)	(264)	(264)	(264)	(264)	(264)	(71)	(41)	(40)
Federal tax	$ millions	(37)	(43)	(34)	(26)	(22)	(20)	(17)	(13)	(8)	–	–
State tax	$ millions	(19)	(20)	(17)	(13)	(12)	(10)	(9)	(7)	(4)	–	–
WC changes	$ millions	(5)	3	4	3	1	2	3	4	(8)	(2)	–
Cash from operations	$ millions	367	290	239	210	185	158	125	77	(58)	(43)	(40)
Capital costs	$ millions	(10)	(10)	(10)	(10)	(5)	(5)	(5)	(5)	–	–	–
Unlevered free cash flow	$ millions	357	280	229	200	180	153	120	72	(58)	(43)	(40)

Model Assumptions

METAL	UNIT	PRICE
Copper	$/lb	$3.10
Molybdenum	$/lb	$10.00
Gold	$/oz	$1,500.00
Silver	$/oz	$18.00

METAL	UNIT	RECOVERIES
Copper	%	90.00%
Molybdenum	%	50.00%
Gold	%	60.00%
Silver	%	60.00%

METAL	UNIT	CONC. GRADE
Copper	%	30.00%
Molybdenum	%	50.00%

METAL	UNIT	PAYABILITY
Copper	%	96.50%
Molybdenum	%	99.00%
Gold	%	90.00%
Silver	%	90.00%

Note: a 0.4% net smelter return royalty is payable on minerals extracted from the Mason claims.

MATERIAL	TYPE	UNIT	CHARGE
Cu concentrate	Treatment	$/dmt	$80.00
Payable moly	Roasting	$/lb	$1.20
Payable copper	Refining	$/lb	$0.08
Payable gold	Refining	$/oz	$5.00
Payable silver	Refining	$/oz	$0.50

MATERIAL	TYPE	UNIT	VALUE
Cu concentrate	Moisture	% H2O	8.00%
Cu concentrate	Blended freight	$/wmt	$119.67
Mo concentrate	Moisture	% H2O	4.00%
Mo concentrate	Blended freight	$/wmt	$72.73

Figure 1: Mason Location Map

The Mason project is located in west-central Nevada, approximately 75 kilometres southeast of Reno and seven kilometres west of the town of Yerington. The area is known as the historic Yerington Mining District due to known historical mining activities.

https://www.globenewswire.com/NewsRoom/AttachmentNg/89db298e-d898-4b48-b2b7-1565d3fd4946

Figure 2: Mason Land Package

Through a combination of patented and unpatented mineral claims on public and private land, the Mason project has a total area of approximately 13,820 hectares, including the land acquired through the Mason Valley acquisition in 2019.

https://www.globenewswire.com/NewsRoom/AttachmentNg/dc4575cd-44d2-42fe-ab83-1f44007456c5

Figure 3: Mason Proposed Site Layout

Proposed site layout including the location of the Mason open pit mine, the processing plant, waste rock facility and tailings management facility.

https://www.globenewswire.com/NewsRoom/AttachmentNg/21526cfc-d5dd-4a51-992a-8a61373cfd48

Figure 4: Mason Valley Historical Mines

The Mason Valley property consists of several past-producing mines with visuals of copper mineralization in the area.

https://www.globenewswire.com/NewsRoom/AttachmentNg/81253ee0-79e4-437d-b8a2-d26212189dd1

________________________ⁱ Copper equivalent grade calculated using the following commodity price assumptions: $3.10 per pound copper, $1,500 per ounce gold, $18.00 per ounce silver and $10.00 per pound molybdenum.

Posted April 6, 2021

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