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Discovery Identifies Multiple High-grade Chimneys and Mantos at the San Jose Mine, Puerto Rico Project

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Discovery Identifies Multiple High-grade Chimneys and Mantos at the San Jose Mine, Puerto Rico Project

 

 

 

 

 

Discovery Metals Corp. (TSX-V:DSV) is pleased to announce the second and final batch of assay results from its detailed underground channel sampling program at the San Jose mine, one of three historic mines comprising its flagship Puerto Rico project  in northern Coahuila State, Mexico. This follows up on the first batch of sampling results from San Jose released on July 18, 2018 (results available at www.dsvmetals.com).

 

 

Taj Singh, P.Eng, President & CEO, states, “Puerto Rico is really coming into focus, with two of the three historic mines now completely mapped and sampled. These new results from San Jose continue to highlight the very strong and consistent grades at the Project. The sampling program of the third historic mine, the Puerto Rico mine, has just wrapped up and we are awaiting assay results. The focus will now shift to drill-planning and prioritizing targets for drilling in 2H18. We are also finalizing plans for an airborne magnetic survey at the Project which will aid in drill-targeting and will also help to identify high-potential regional targets surrounding the historic mines’ area.”

 

 

Results & Discussion

 

 

San Jose contains approximately 630m of underground drifts and stopes over four levels (from bottom to top: the Chuyon, Haulage, Rope and Upper levels) that span an approximate vertical extent of 50m and cover a horizontal extent of approximately 80m by 80m. All four levels host strongly mineralized mantos, chimneys and faults. Channel samples were collected at 3-5m intervals along both sides of the entire length of the developed workings. The first batch of assay results (71 samples) was exclusively from the Chuyon level (see news release dated July 18, 2018), while the new results released herein are from the Haulage, Rope and Upper levels (157 samples). Sampling methodology is outlined in detail in the Technical Notes section of this release. Sampling locations and widths were restricted to the extent of historic workings. The table below highlights assay results of 15 of the most significant individual channels from the new batch of results sorted by ZnEq (see References section for ZnEq and AgEq assumptions):

 

 

Sample
number
San Jose
mine Level
Width
(m)
Ag
(g/t)
Zn
(%)
Pb
(%)
Cu
(%)
AgEq
(g/t)
ZnEq
(%)
Mineralization type /
Host rock
215523 Haulage 1.2 10 46.2 0.2 0.2 2,819 46.8 manto
215532 Rope 0.4 15 42.3 0.5 0.9 2,689 44.7 chimney
215504 Haulage 0.7 154 38.2 0.6 0.1 2,493 41.4 chimney
215519 Haulage 0.5 6 37.9 0.1 0.2 2,314 38.5 manto
215525 Haulage 0.6 9 37.3 0.3 0.3 2,305 38.3 chimney
215524 Haulage 0.8 6 37.5 0.1 0.1 2,284 37.9 chimney
215509 Haulage 0.7 20 34.9 0.7 0.2 2,173 36.1 chimney
215563 Rope 1.0 18 30.2 0.1 2.6 2,159 35.9 manto
215555 Upper 0.5 294 14.3 16.9 1.0 1,944 32.3 fault
215482 Haulage 0.5 8 29.5 0.3 0.1 1,802 29.9 manto 
215547 Upper 1.0 445 3.5 26.30.1 0.6 1,778 29.6 chimney
215546 Upper 1.2 47 22.9 0.5 1.9 1,668 27.7 chimney
215501 Haulage 0.9 24 26.5 0.5 0.1 1,648 27.4 chimney
215549 Upper 1.3 61 18.1 7.1 1.2 1,578 26.2 chimney
215539 Rope 1.3 129 15.9 6.5 1.7 1,554 25.8 chimney

 

 

Composite channels, composed of 2-3 contiguous individual channels were also taken during the program. The three top composites, sorted based on width x grade, are shown below:

 

 

Sample
numbers
San Jose
mine Level
Width
(m)
Ag
(g/t)
Zn
(%)
Pb
(%)
Cu
(%)
AgEq
(g/t)
ZnEq
(%)
Mineralization type /
Host rock
215547-548 Upper 2.3 199 6.8 11.6 0.3 1,114 18.5 chimney / fault
215499-501 Haulage 1.7 27 24.0 0.4 0.1 1,505 24.9 chimney
215550-551 Upper 1.5 116 5.0 10.5 0.3 873 14.5 manto / wallrock

 

Key findings and interpretations:

 

  • Ag-Pb-Zn-Cu mineralization is present in limestone-hosted mantos (parallel to bedding) and chimneys and faults (discordant to bedding). The predominant alteration types occurring at San Jose include moderate to strong recrystallization of limestone wallrock, calcite veining, and iron oxide alteration. These mineralized bodies have undergone surficial oxidation, resulting in a mix of metal-bearing sulphides and oxides.
  • Three mantos, two chimneys and two mineralized faults were identified. Sampled manto widths range from 0.5-1.5m (restricted by dimensions of workings) and are open in all directions laterally (along strike and dip). Based on field observations from the other historic mines at Puerto Rico, there is potential for additional stacked mantos below. Sampled chimney widths range up to 2.3m but field observations suggest the potential for larger widths, as the main part of a historic stope that mined chimney mineralization had a width of 5-6m. Both chimneys are open along strike and to depth. Mineralized faults widths range from 0.4-1.4m, and are open along strike and to depth.
  • The average grades of the chimneys, mantos and mineralized faults at San Jose is shown below:

 

 

Mineralization samples (#) Ag (g/t) Zn (%) Pb (%) Cu (%) ZnEq (%)
Manto 1 2 141 8.0 11.1 0.2 18.1
Manto 2 16 19 13.6 1.1 0.3 15.2
Manto 3 14 229 17.6 9.3 0.3 28.2
Chimney 1 20 54 10.8 2.2 0.5 14.3
Chimney 2 20 57 13.9 3.1 0.5 17.8
Minz. Fault 1 23 53 4.0 5.3 0.7 9.9
Minz. Fault 2 20 10 2.2 0.4 0.1 2.7
  • In addition, the wallrock of the workings at San Jose carried significant mineralization. Average wallrock grades from all four levels were 5.2%, 0.5%, 3.1% and 3.2% ZnEq respectively.
  • Cu values were consistently significant, indicating potential proximity to an intrusive source. The highest values of Cu were hosted within chimneys and faults.

 

 

ABOUT DISCOVERY METALS

 

 

Discovery Metals is focused on discovering and advancing high grade polymetallic deposits in a recently assembled land package of approximately 300,000 hectares over a large and historic mining district in northern Coahuila State, Mexico. The portfolio of seven key properties, all with shallow high-grade silver-zinc-lead mineralization, is situated in a world class CRD belt that stretches from southeast Arizona to central Mexico. The land holdings contain numerous historical direct-ship ore workings with approximately 4km of underground development. No modern exploration or exploration drill testing has been carried out on the properties prior to Discovery’s time on the projects.

 

Posted August 23, 2018

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