GoGold Resources Inc. (TSX: GGD) (OTCQX: GLGDF) is pleased to release the results of its initial Preliminary Economic Assessment at its Los Ricos South Project located in Jalisco State, Mexico.
Highlights of the PEA, with a base case silver price of US$21.00/oz and gold price of US$1,550/oz are as follows (all figures in US dollars unless otherwise stated):
“The acquisition of the Los Ricos district, only 22 months ago in March 2019, has proven to be a tremendous catalyst of growth for GoGold,” said Brad Langille, President and CEO. “More importantly, this has been accomplished with the first of many targets in the Los Ricos district. This PEA demonstrates the strong economics of the district which will continue to expand as we drill additional targets. We feel the PEA is the first step in unlocking the significant potential of the Los Ricos district and creating additional value for our shareholders. With our strong balance sheet and cash flow from our operating mine, we are now aggressively advancing Los Ricos North with a 100,000m drill program and targeting an initial Mineral Resource in 2021.”
What’s Next for Los Ricos South
In 2021, the Company will continue the engineering studies required for a pre-feasibility study. These studies include further defining the capital and operating costs including geotechnical drilling and bedrock studies, civil earthworks, metallurgical studies, and socio-economic programs with the local, State and Federal authorities.
Plan for Resources and Discovery – Los Ricos North
The Company’s focus for Los Ricos North in 2021 will be to define the initial NI 43-101 compliant Mineral Resource. During 2020, GoGold’s exploration team identified over 100 targets on the Los Ricos North properties, demonstrating the significant exploration potential. The Company plans to drill 10 of these targets as part of its 2021 drilling program which is planned to exceed 100,000 metres of drilling and will be one of the largest in Mexico.
The PEA was prepared by independent consultants P&E Mining Consultants Inc (“P&E”), with metallurgical test work completed by SGS Canada Inc.’s Lakefield office (“SGS”), geotechnical study by Golder & Associates of Tucson, process plant design and costing by D.E.N.M. Engineering Ltd., and environmental and permitting led by CIMA Mexico.
Table 1 below shows the key economic assumptions and results of the PEA, with Table 2 showing a sensitivity analysis based on varying metal prices and assumptions, and Table 3 showing a sensitivity analysis based on changes to operating and capital costs.
Table 1 – Los Ricos South PEA Key Economic Assumptions and Results
|Assumption / Result||Unit||Value||Assumption / Result||Unit||Value|
|Total OP Plant Feed Mined||Kt||10,228||Net Revenue||US$M||1,437.6|
|Total UG Plant Feed Mined||Kt||4,983||Initial Capital Costs||US$M||125.1|
|Total Plant Feed Mined||Kt||15,211||Sustaining Capital Costs||US$M||62.3|
|Operating Strip Ratio||Ratio||7.7||OP Mining Costs||$/t Feed||18.33|
|Silver Grade1||g/t||99.59||UG Mining Costs||$/t Feed||30.31|
|Gold Grade1||g/t||0.78||LOM Mining Costs||$/t Feed||22.32|
|AgEq Grade1||g/t||157.31||Operating Cash Cost||US$/oz AgEq||8.65|
|Silver Recovery||%||88||All in Sustaining Cost||US$/oz AgEq||11.35|
|Gold Recovery||%||93||Mine Life||Yrs||11|
|Silver Price||US$/oz||21.00||Average process rate||t/day||5,000|
|Gold Price||US$/oz||1,550||After-Tax NPV (5% discount)||US$M||295.0|
|Copper Price||US$/lb||3.00||Pre-Tax NPV (5% discount)||US$M||465.9|
|Payable Silver Metal||Moz||42.9||After-Tax IRR||%||45.8|
|Payable Gold Metal||Koz||352.9||Pre-Tax IRR||%||64.1|
|Payable Copper||Mlb||4.5||After-Tax Payback Period||Yrs||2.0|
|1.||Grades shown are LOM average feed grades including both OP and UG sources. Dilution of approximately 15% for OP material and 34% for UG material was used.|
Table 2 – Los Ricos South PEA Gold and Silver Price Sensitivities
|Gold Price (US$/oz)||1,200||1,300||1,450||1,550||1,650||1,800||2,000|
|Silver Price (US$/oz)||16.26||17.61||19.65||21.00||22.35||24.39||27.10|
|After-Tax NPV (5%) (US$M)||136.5||181.8||249.7||295.0||340.2||408.1||498.7|
|After-Tax Payback (years)||3.6||3.0||2.5||2.0||1.9||1.8||1.7|
Table 3 – Los Ricos South PEA Operating Expense and Capital Expense Sensitivities
|Operating Costs – NPV (US$M)||352.3||323.6||295.0||266.3||237.6|
|Operating Costs – IRR||52.2%||49.0%||45.8%||42.5%||39.1%|
|Capital Costs – NPV (US$M)||318.4||306.7||295.0||283.2||271.5|
|Capital Costs – IRR||56.9%||50.3%||45.8%||40.2%||36.1%|
Capital and Operating Costs
The Los Ricos South Project has been envisioned as a combined open pit and underground mining operation, with contract open pit mining in years one to six of the mine plan, and contract underground mining in years six to eleven.
The processing plant is comprised of conventional crushing and grinding followed by cyanide tank leaching. Back end filtration is required to maximize water recycling (dry stack tailings) as well as a SART (sulfidation, acidification re-neutralization and thickening) circuit to re-generate cyanide back to the process and to produce a saleable Cu2S copper sulfide product. Water supply to the process plant is provided by a nearby seasonally charged water dam and high voltage grid power is provided by the local utility.
Key components of the capital cost estimate are provided in Table 4 and operating costs are provided in Table 5.
Table 4 – Capital Cost Estimate
|Initial Capital||Cost (US$M||Sustaining Capital||Cost (US$M)|
|Plant direct costs||68,008||Underground Development||45,723|
|Pre-stripping||17,628||Plant Direct Costs||7,800|
|Project indirect costs||9,098||Open Pit Development||680|
|Contingency (15%)||16,321||Contingency (15%)||8,130|
|Total – Initial Capital||125,132||Total – Sustaining Capital||62,333|
|Capital – Initial & Sustaining||187,465|
Table 5 – Operating Costs (Average LOM)
|Operating Costs (Average LOM)||US$/tonne
|Open Pit Mining1||18.33||1.89|
|Total LOM Mining3||22.32|
|Processing ($/t processed)||16.26|
|General and admin ($/t processed)||1.54|
|Total ($/t processed)||40.12|
|1.||Open pit mining costs include a double-benched waste rock of $1.82/t and mineralized material cost of $2.52/t|
|2.||Bulk underground long hole mining. $30.31 is the cost of in-stope mining, additional development costs of $12.35/t mined are included in sustaining capital in table 4, providing a total UG mining cost of $42.66/t|
|3.||Average LOM mining cost of both open pit and underground|
The open pit mining will be contracted and carried out by drill and blast followed by conventional loading and truck haulage to the waste rock storage facilities and the processing plant. The contract underground mining will involve long hole stoping and cemented paste back filling of the mined-out stopes. A cement reinforced plug will be placed in the bottom of the open pits after they are mined out to provide additional support for underground mining of the crown pillars to maximize mineralized material recovery.
A metallurgical test program was carried out by SGS Lakefield of Ontario, Canada. The program included grinding and leaching as well as comminution testing. The leach samples comprised of drill core rejects representing the various zones of the Mineral Resource and whole HQ drill core for the comminution work. This preliminary test program estimated a gold and silver recovery of 93% and 88%, respectively.
Surface Rights Agreement
The Company has signed an agreement with the Ejido of Cinco Minas, which owns the surface rights over all of those concessions included in this PEA. The agreement allows GoGold to mine and explore the 1,280 hectares of land that is owned by the local Ejido for a period of twelve years with an option to renew for a further twelve years.
Mineral Resource Estimate
The basis for the PEA is the Mineral Resource Estimate completed by P&E in the National Instrument 43-101 Technical Report on the Initial Mineral Resource Estimate for the Los Ricos South Project located in Jalisco State, Mexico, which has an effective date of July 28, 2020. A summary of the Mineral Resource Estimate is provided in Table 6.
Table 6: Los Ricos South Mineral Resource Estimate – Pit Constrained and Out-of-Pit(1-8)
|Mining Method||Category||Tonnes||Average Grade||Contained Metal|
|1.||Mineral Resources which are not Mineral Reserves do not have demonstrated economic viability. The estimate of Mineral Resources may be materially affected by environmental, permitting, legal, title, taxation, socio-political, marketing, or other relevant issues.|
|2.||The Inferred Mineral Resource in this estimate has a lower level of confidence than that applied to an Indicated Mineral Resource and must not be converted to a Mineral Reserve. It is reasonably expected that the majority of the Inferred Mineral Resource could be upgraded to an Indicated Mineral Resource with continued exploration.|
|3.||The Mineral Resources in this news release were estimated in accordance with the Canadian Institute of Mining, Metallurgy and Petroleum (CIM), CIM Standards on Mineral Resources and Reserves, Definitions and Guidelines prepared by the CIM Standing Committee on Reserve Definitions and adopted by the CIM Council.|
|4.||Historically mined areas were depleted from the Mineral Resource model.|
|5.||The pit constrained AuEq cut-off grade of 0.43 g/t Au was derived from US$1,400/oz Au price, US$16/oz Ag price, 93% process recovery, US$18/tonne process and G&A cost. The constraining pit optimization parameters were $2.00/t mineralized mining cost, $1.50/t waste mining cost and 50-degree pit slopes.|
|6.||The out-of-pit AuEq cut-off grade of 1.4 g/t Au was derived from US$1,400/oz Au price, US$16/oz Ag price, 93% process recovery, $40/t mining cost, US$18/tonne process and G&A cost. The out-of-pit Mineral Resource grade blocks were quantified above the 1.4 g/t AuEq cut-off, below the constraining pit shell and within the constraining mineralized wireframes. Out–of-Pit Mineral Resources are restricted to the Los Ricos and Rascadero Veins, which exhibit historical continuity and reasonable potential for extraction by cut and fill and longhole mining methods.|
|7.||No out-of-pit Mineral Resources are classified as Measured.|
|8.||AgEq and AuEq were calculated at an Ag/Au ratio of 87.5:1.|
The Preliminary Economic Assessment Technical Report will be filed on SEDAR within 45 days of this news release.
Robert Harris, P.Eng. and David Duncan, P.Geo. are the GoGold Qualified Persons and Eugene Puritch, P.Eng., FEC, CET, president of P&E Mining Consultants Inc. is the Independent Qualified Person all as defined by National Instrument 43-101 and whom are responsible for the technical information in this press release.
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Access the GoGold Company Profile on VRIFY at: https://vrify.com
Los Ricos District Exploration Projects
The Company’s two exploration projects at its Los Ricos property are in Jalisco state, Mexico. The Los Ricos South Project began in March 2019 and includes the ‘Main’ area, which is focused on drilling around a number of historical mines including El Abra, El Troce, San Juan, and Rascadero, as well as the Cerro Colorado, Las Lamas and East Vein targets. An initial Mineral Resource on the Los Ricos South project was announced on July 29, 2020 and indicated a Measured & Indicated Mineral Resource of 63.7 million ounces AgEq grading 199 g/t AgEq contained in 10.0 million tonnes, and an Inferred Mineral Resource of 19.9 million ounces AgEq grading 190 g/t AgEq contained in 3.3 million tonnes.
The Los Ricos North Project was launched in March 2020 and includes drilling at the El Favor, La Trini, and El Orito targets.
About GoGold Resources
GoGold Resources is a Canadian-based silver and gold producer focused on operating, developing, exploring and acquiring high quality projects in Mexico. The Company operates the Parral Tailings mine in the state of Chihuahua and has the Los Ricos South and Los Ricos North exploration projects in the state of Jalisco. Headquartered in Halifax, NS, GoGold is building a portfolio of low cost, high margin projects.
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