The Pinson Underground mine is located 30 miles east of Winnemucca in Humboldt County, Nevada. The mine is in the south-central portion of the Getchell Gold Belt southwest of Barrick's Getchell/Turquoise Ridge Mines and Newmont's Twin Creeks Mine complex. Prior to 2000, Pinson produced over 987,000 ounces of gold from oxidized ore by open pit mining and oxide heap-leach and mill recovery.
Gold mineralization is characterized as a Carlin-type, sediment-hosted gold system hosted by the same sequence of Ordovician sedimentary rocks that hosts the gold deposits of Twin Creeks and Turquoise Ridge mines to the north.
Development of the Pinson underground mine commenced in early 2012 and the primary spiral was driven to the 4530 level from the 4650 adit level (120 feet below the mine portal). A total of 30,150 tons of mined ore was shipped from which 6,834 ounces were recovered during development, prior to the mine being placed on a care and maintenance in June 2013 due to deteriorating gold market conditions.
After making a number of improvements to the operating plan, Atna re-started underground mining in June of 2014 and began selling its ore to Newmont's nearby Twin Creeks metallurgical facility. Pinson Underground contains numerous ore zones. The principal zones are the Ogee (OG), Range Front (RF), Otto, Adams Peak (AP), and the CX. Opening up additional ore zones will create greater flexibility with more working faces and an increased number of mining options. This flexibility should improve productivity and help to reduce overall operating cost.
Pinson Underground reserves are supported by the NI 43-101 Technical Report and Pre-Feasibility Study on the Pinson property titled “NI 43-101 Technical Report, Pinson Project, Preliminary Feasibility Study, Humboldt County, Nevada” dated October 17, 2014 with an effective date June 30, 2014 (filed on SEDAR in October 2014) (the “Pinson Technical Report”), endorsed by Richard E. Kiel, PE, Edward H. Minnes, PE, and Russ Browne, PE, all of Golder Associates Inc., Joseph M. Keane, PE of SGS Metcon/KD Engineering, Donald E. Hulse, P.E. of Gustavson Associates, LLC and Mark A. Odell, PE, and Karl T. Swanson, SME, MAusIMM, of Practical Mining LLC. Mineral reserves have been updated and reconciled for mine production in 2014 and are current as of December 31, 2014.
Mineral Resources include Proven and Probable Reserves.
Pinson Mineral Resource is supported by Pinson Technical Report, NI 43-101 Technical Report, dated October 17, 2014: using 0.22 opt sulphide and 0.190 opt oxide cut-off. The underground resource has been reconciled against development and mining completed through December 31, 2014.
The information presented on this web page was prepared under the supervision and review of William Stanley, V.P. Exploration of Atna, a Registered Member of the Society for Mining, Metallurgy, and Exploration, a Licensed Geologist and Qualified Person, as defined in NI 43-101, and has verified the authenticity and validity of the technical information contained herein.
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