The Winston Gold Project is central to a historic precious and base metal mining
district in which most ore was mined from tightly structurally controlled high-angle fissure veins and lode/replacement zones and a little from adjacent stock work veining.
These deposits are classified as steeply dipping syn-tectonic fissure quartz-sulfide vein systems (Klepper, 1971).
Both epithermal (gold-silver-quartz) and mesothermal (lead-zinc-silver-gold) base
metal assemblages are common in the overall district and base metal sulfides are more abundant with depth in the workings. The sulfides are generally oxidized above the 4,180 foot elevation in the Winston Gold project area.
The historic gold deposits in the Winston area are hosted in quartz veins and related replacement zones. Auriferous pyrite-bearing base-metal and precious-metal veins host most of the known mineralization.
The longest vein mined is the Custer Mine vein which was mined continuously for over 2,400 feet (731 m). Reported vein widths vary widely between less than a foot (0.3 m) and several tens of feet.
Records indicate that more than 100,000 ounces of gold was recovered from these underground mines in the late 19th to early 20th century from about 150,000 tons of ore (Earle, 1964; Schell, 1963). This works out to an average grade of about 0.67 ounces per ton or 22.8 grams gold per tonne. Historic records indicate that the Custer mine was a major contributor to this production estimate.
The gold-bearing quartz fissure veins on the Winston Property are associated with the late Cretaceous-to early Tertiary age Edna Stock, a 400-by-800 meter porphyry pluton, which intrudes volcanic rocks of similar age and Cambrian to Cretaceous age sedimentary rocks. The most significant was the Custer Vein, which strikes N30E and dips 70N.
The primary rocks found in outcrop are Cretaceous in age and include the undifferentiated members of the Elkhorn Mountains Volcanic Rocks, which are overlain and grade into sedimentary and volcaniclastic rocks. These are intruded by intrusive felsic and intermediate rocks.
Unconsolidated and poorly consolidated Tertiary-aged and younger sediments and sedimentary rocks overlie the older rocks in the eastern Winston Gold Project area and massive debris flows cover some areas in the central project area.
Dr Richard C Capps, the author of the NI43-101 Technical Report on the Winston Project, and the company’s Qualified Person stated:
“The Winston Mining District mineralization has little potential for large scale bulk mineable deposits and high potential for underground mining. Recent drilling by Winston Gold in 2014 (Porterfield, 2015) confirmed gold mineralization cut in earlier drill holes and discovered at least eight (8) previously unknown mineralized veins. This recent drilling shows that the mineralized zones are both narrower and of higher grade than suggested by the historic composite samples.”
The gold mineralization intersected in 2014 drilling is hosted by at least two generations of mineralized veins. The earliest veins trend east-west, and dips are seldom more than 40 degrees. These veins have southerly dips in the west Edna area. The younger veins, such as the Custer vein, are high angle and cut the earlier veining. These veins trend northeast and generally follow the trend of the Edna intrusive. They are more sulfide-rich than the earlier veins.
Click below to access full NI43-101 report written by Dr. Richard C Capps, SME Registered Geologist and Qualified Person.