Hedley Monarch Mine, Olalla, Osoyoos Mining Division, British Columbia, Canadai

Regional Level Types
Hedley Monarch Mine	Mine
Olalla	- not defined -
Osoyoos Mining Division	Division
British Columbia	Province
Canada	Country

In the Hedley Monarch mine, gold most commonly occurs as platelets along fissures and rarely as blebs in epigenetic hydrothermal quartz veins hosted by a pyroxenite unit of the Carboniferous to Triassic Shoemaker Formation. Chalcopyrite, galena, sphalerite, tetrahedrite, pyrite, and hessite are associated with the gold in the vein. Some open fractures are lined with drusy brown fluorite cubes to 2 mm. A few micros (less than 1 mm) of gold crystals were found, but the crystals were too small to accurately discern forms (Mauthner and Francis, 2006). The mine was only active for a short time in 1948.

By SEM-EDS analysis one gold grain contained 92.20% Au, 6.59 Ag, and 1.21 Cu. Another tellurian gold??? grain appeared to contain 88.93% Au, 1.54 Ag, 2.52 Cu, and 7.03 Te. A sphalerite grain contained 59.09% Zn, 3.67 Cd, 0.25 Fe, and 0.14 Ni. The median of three similar petzite? grains contained 36.9% Ag, 2.5 Cu, 24.6 Au, and 37.2 Te. An apparent "uytenbogaardite" contained 40.00% Ag, 39.12 Au, 4.66 Cu, 13.83 S, and 2.40 Te. R.C.S. II on a specimen purchased from David K. Joyce.

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References