• Subscribe
  • TSX.V: NEE
  • OTC-Nasdaq Intl.: NHVCF

Moss Gold-Silver Mine, NW Arizona, USA


  • 100% owned Moss Gold-Silver Mine in NW Arizona State
  • Achieved commercial production in September 2018
  • Low cost, open pit mining (1.85 to 1 strip ratio) with heap leach processing
  • Gold recoveries of 82% with silver recoveries of 65%
  • 2017 PEA outlined a 10-year mine life, $133 NPV and a 63% IRR (before taxes)
  • Crushing currently exceeding 2015 Feasibility Study of 5,000 tonnes per day (tpd)  
  • Excellent exploration upside adjacent to open pit and within the Oatman mining district 


Northern Vertex Mining Corp. is currently operating it’s 100% owned Moss Gold-Silver Mine in NW Arizona, USA, situated approximately one hour and a half drive south of Las Vegas, Nevada. The Company optioned Moss in 2011 and advanced the project by completing a pilot plant test facility in 2014 and a Feasibility Study in 2015.  Northern Vertex also completed a Preliminary Economic Assessement later in 2017, which featured an extension to its life of mine to 10 years.  Subsequent to the construction and the commissioning process, the Company declared commercial production at the Moss Mine, in September 2018.


The Moss Mine is an open pit gold-silver operation, with a favorable strip ratio of 1.85:1 (waste to ore) and minimal haul distances to the crushing plant.  Metallurgical test-work along with the completion of the pilot plant operations in 2014 and current production validates that the Moss orebody is amenable to gold and silver heap leach process with recoveries of 82% gold and 65% silver.  The most economic and effective process is heap leaching of crushed and agglomerated ore followed by processing at the Company’s on-site Merrill Crowe metal recovery plant and refinery to produce gold and silver doré bars.  According to the Northern Vertex’s Feasibility Study (2015) throughput at the Moss Mine was expected to be 5,000 tonnes per day (tpd). However, production is now expected to be significantly higher due to exceptional performance of the crushing plant and operational team, which established a one-day throughput record of 13,000 tonnes during the commissioning phase. 


Resource CategoryTonnesAu
Au Eq
Au Eq
Measured & Indicated15,480,0000.769.3377,0004,610,0000.87435,000

NI 43-101 Technical Report Feasibility Study , “Mohave County Arizona” Report by M3 Engineering, Effective date June 8, 2015 calculated the Mineral Resource Estimate within a pit constrained LG pit with maximum slope angles of 65◦. Metal prices of $1,250/oz and $20/oz were used for gold and silver respectively. Metallurgical recoveries of 82% for gold and 65% for silver were applied. • A 0.25 g/t gold cut-off was estimated based on a total process and G&A operating cost of $6.97/t of ore mined.


Technical Report, 2017 PEA Phase III, Mine Life Extension
Technical Report, 2015 Feasibility Study, Mohave County
Technical Report, 2014 Mineral Resource Update