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Golden Minerals Identifies High-Grade Gold and Silver Veins at Yoquivo

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Golden Minerals Identifies High-Grade Gold and Silver Veins at Yoquivo






Golden Minerals Company (NYSE American and TSX: AUMN) is pleased to announce high-grade silver-gold assays from its Yoquivo project located in Chihuahua, Mexico.


Yoquivo Sampling Highlights:


  • 6m assaying 5.9 grams per tonne (“g/t”) Au and 937 g/t Ag from the Pertenencia Vein
  • 4m assaying 2.3 g/t Au and 489 g/t Ag from the Central Breccia Zone
  • 2.9m assaying 2.3 g/t Au and 345 g/t Ag from the San Francisco Vein
  • 6m assaying 1.7 g/t Au and 399 g/t Ag from the Pertenencia Vein


The Yoquivo district is located on the headwaters of the Mayo River in the northern part of the Sierra Madre Occidental, approximately 45 kilometers (“km”) west of San Juanito. The property is located 32km south of Agnico Eagle’s Pinos Altos Mine (2018 production est. 170,000 oz Au1) and 35km southeast of the Ocampo mining district (a gold producer sold to Minera Frisco for (US) $750M in 20122).


The Yoquivo property covers an erosional ‘window’ of andesites beneath Oligocene-aged rhyolites. Multiple silver-gold bearing epithermal veins have been mapped and sampled. The two most important veins are the San Francisco and Pertenencia veins, both of which have been mapped and sampled over a 2km strike length. Numerous splays and parallel structures have also been identified and sampled.


To date, 756 samples have been collected, and the sampling program has identified and sampled a series of low-sulfidation quartz veins and breccias. The most promising results from the surface sampling program are summarized in Table 1, with surface sample results shown in Figures 2 and 3 below.


Table 1: Selected results from the 2018 Yoquivo sampling program


  Vein Width (m) Au g/t Ag g/t AuEq g/t AgEq g/t  
  San Francisco 2.05 4.2 29 4.6 365  
  San Francisco 0.95 2 205 4.6 365  
  San Francisco 2.9 1.4 284 5.0 396  
  San Francisco 3.4 0.2 384 5.0 400  
  San Francisco 1.8 2.3 166 4.4 350  
  San Francisco 0.9 0.1 435 5.5 443  
  San Francisco 0.8 7.9 122 9.4 754  
  San Francisco 2.90 1.4 191 3.8 303  
  Including 0.80 2.1 432 7.5 600  
  San Francisco 2.90 2.3 345 6.6 529  
  Including 1.40 4.7 681 13.2 1,057  
  San Francisco 1.1 1.5 356 6.0 476  
  San Francisco 1 0.9 294 4.6 366  
  San Francisco 3.00 1.5 226 4.3 346  
  San Francisco 3.00 0.5 622 8.3 662  
  Including 0.90 1.2 1,299 17.4 1,395  
  La Muralla 0.65 3.2 404 8.3 660  
  Central Breccia 4.00 2.3 489 8.4 673  
  Including 0.90 9.8 2,090 35.9 2,874  
  Central Breccia 0.95 1 349 5.4 429  
  Central Breccia 0.70 2.8 285 6.4 509  
  Pertenencia 1.60 3.7 162 5.7 458  
  Including 0.45 12.3 398 17.3 1,382  
  Pertenencia 1.40 2.4 234 5.3 426  
  Pertenencia 1.65 1.5 392 6.4 512  
  Pertenencia 2.15 0.2 528 6.8 544  
  Including 0.30 0.1 1095 13.8 1,103  
  Pertenencia 6.00 1.6 268 5.0 396  
  Including 1.00 1.6 672 10.0 800  
  Pertenencia 6.00 1.7 399 6.7 535  
  Including 1.00 4.4 916 15.9 1,268  
  Pertenencia 6.00 5.9 937 17.6 1,409  
  Including 1.00 27.7 4,050 78.3 6,266  
  Pertenencia 1.90 0.8 281 4.3 345  
  Dolar 0.10 11.7 35 12.1 971  
  La Nina 2.1 3.4 105 4.7 377  


Note:  AuEq and AgEq are calculated using metal prices of Au = $1,120/Oz and Ag = $14/oz for an 80:1 ratio, results were reported for samples returning >300 g/t AgEq.


Complete results (from 756 samples collected to date) are available on the Golden Minerals website at, as well as a more detailed surface map.


The sampling program has systematically collected channel samples from the 2.2km-long San Francisco vein as well as several splays and parallel structures.  The San Francisco vein occurs as a series of quartz‐calcite veins and vein breccias with widths up to 3.4m.


A new vein, the La Nina vein, was discovered in the northwest of the property where it splits off from the main San Francisco vein. It consists of a prominent banded epithermal quartz‐calcite vein up to 2.1m wide which has been mapped and sampled along a 350m strike length. Initial results have returned assays up to 3.4 g/t Au and 105 g/t Ag over 2.1m width.


Exploration is now focusing on the Pertenencia vein which consists of a series of 0.5m-3m wide quartz‐calcite epithermal veins and breccias.  The mineralization appears to be more silver-rich compared to the San Francisco vein, but sampling is still in progress.


“Our progress to date in defining high-grade veins outcropping at surface at Yoquivo is excellent.  We expect to continue with the surface work in preparation for identifying the best drill targets, which we plan to test in a drill program in 2019.  The discovery of additional untested veins on the property is promising. We believe the Yoquivo district is emerging as a very interesting exploration play in this well-mineralized portion of the Sierra Madre,” states Warren Rehn, President and Chief Executive Officer of Golden Minerals.


Next Steps


Mapping and sampling have only been conducted on approximately 40% of the property. Golden Minerals has commenced a regional exploration program to search for additional veins that might outcrop on the property. In addition, the Company hopes to conduct underground mapping and sampling of the various accessible mine workings, including those of the Creel Mine, the largest historic workings on the property. The targeting work is expected to lead up to a drill program to test the most promising portions of the veins in 2019. 


About Yoquivo


Golden holds an option to purchase six concessions that comprise the Yoquivo property, totaling 2,367.6 hectares located in western Chihuahua State in northern Mexico, for payments totaling $0.5 million over four years and subject to a 2% NSR royalty on production capped at $2 million.  The claims cover an underexplored epithermal precious metals district that shows similar mineralization to the adjacent Ocampo mining district, and the Company, through systematic exploration, hopes to identify significant high-grade mineralization. 


Review by Qualified Person and Quality Control


The technical contents of this press release have been reviewed by Warren M. Rehn, M.Sc., a Qualified Person for the purposes of Canadian National Instrument 43‐101. Mr. Rehn has over 33 years of mineral exploration experience and is a QP member of the Mining and Metallurgical Society of America.


To ensure reliable sample results, Golden Minerals uses a quality assurance/quality control program that monitors the chain‐of‐custody of samples and includes the insertion of blanks, duplicates and reference standards in each batch of samples. Core is photographed and sawn in half with one half retained in a secured facility for verification purposes. Sample preparation (crushing and pulverizing) is performed at an independent ISO 9001:2001 certified laboratory in Chihuahua or Zacatecas, Mexico. Prepared samples are direct‐shipped to an ISO 9001:2001 certified laboratory in Canada.


About Golden Minerals


Golden Minerals is a Delaware corporation based in Golden, Colorado. The Company is primarily focused on advancing its El Quevar silver property in Argentina and on acquiring and advancing mining properties in Mexico with emphasis on areas near its Velardeña processing plants.




1Pinos Altos est. 2018 production from Agnico Eagle Website


2Aurico Gold to sell the Ocampo Mine to Minera Frisco for US$750M



Posted October 31, 2018

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