Bayhorse Silver Mine
The Bayhorse Silver Mine is now in an active mining state, where the mineralized material extracted from the mine is being upgraded using a state of the art “Steinert” Ore-Sorter.
The Bayhorse Property has been historically identified as the location of the largest silver deposit found in the state of Oregon.Mining has been conducted intermittently at Bayhorse since the early 1920’s and the mine last closed after the price of silver dropped to under US$6/oz in late 1984. The Bayhorse mine has two existing accessible rehabilitated adits where mineralized material is being extracted.
With a maiden resource comprised of 292,300 short tons at an average grade of 21.65 troy ounces per ton (opt) silver (Ag) for total contained silver of 6,328,400 ounces. The mineralized material contains significant amounts of copper (Cu) and zinc (Zn), however the historic data utilized in the mineral resource estimate did not allow for a reliable calculation of the grade of Cu and Zn.
The main adit extends 900 feet westward into the hill and the lower extending about 500 feet into the hill. The Intermediate Level workings were accessed by an adit installed in 1984. Until then that level was reached only by raises from the lower level and winzes from the upper level. Three areas have been stoped in the ground between the upper and intermediate level.
Total reported historic production from the Bayhorse Mine through 1959 was 286,000 ounces of silver from 8,300 tons of ore for an average of approximately 35.5 opt Ag (1,217 g/t Ag).Herdrick (1981) estimated remaining shipping ore at a 7.5 opt Ag cutoff to be 166,208 tons. provides no production and shipping records
The maiden resource was calculated, in part, on 90 underground drill holes totaling approximately 15,000 feet in 1984 that delineated approximately 26,000 tons of silver bearing mineralization of which 5,718 tons were reported being produced at an average grade of 16.7 opt Ag (572.5 g/t Ag) while approximately 20,000 tons reportedly remained unmined. The historic records also indicate that of the 5,718 tons produced, approximately 23% reportedly graded between 21 – 100 opt Ag, 71% reportedly graded between 6 opt – 20 opt Ag and 6% reportedly graded less than 6 opt Ag. Ancilliary copper produced reportedly averaged 1% Cu. The highest reported grade from the 1984 drilling, sampling and mining program was a round that reportedly assayed 691 opt Ag (23,691 g/t Ag) and 15.72% Cu from a tetrahedrite-tennantite rich vein.
Historic reports indicate that the mineralization, consisting mainly of acanthite, tehrahedrite/tennantite, occurs in a 80 feet wide and 22 feet thick zone extending for a known 840 feet along an andesite and rhyolite contact. The Company has extended the thickness of the mineralized zones from 20 feet, to approximately 70 feet. Minor copper, arsenic, and vanadium are associated with the silver. Azurite and malachite coatings are common in oxidized parts of mineralized ground on the walls of the excavated stopes. Additional minerals include enargite, dufrenoysite and cuprodesclosite. Gold values of up to 10 g/t Au have also been reported in the mineralization.
There can be no assurance that additional work will result in the definition of the current resource being upgraded to a reserve.