Mineralization on the Blue Moon Mazeppa prospect consists of at least three separate types of mineralization (Freeman, 1992). Gold-bearing quartz shear zones of the Blue Moon shaft consist of thin quartz-bearing shear zones (6 inches to 3 feet wide) that contain free gold, pyrite, arsenopyrite, stibnite and minor sphalerite; grades are up to 4 ounces of gold per ton (Prindle, 1910). A large proportion of the free gold is disseminated within pyrite and arsenopyrite grains.

Massive coarse-grained stibnite mineralization was also uncovered on the Blue Moon Mazeppa prospect. The stibnite lode uncovered was reported to be 8 feet wide and was exposed over 100 feet of strike length (J. Taylor, oral communication, 1986).

The property was located as the Blue Bell lode in 1903 and development work began in 1909 with a 24 foot shaft. This shaft was flooded with water seepage from Chatham Creek and was abandoned (Smith, 1913, B 525; Prindle, 1910). A second shaft was sunk approximately 100 feet upslope from the first shaft and reached a depth of 85 feet before it too was abandoned due to heavy water influx (Prindle, 1910). In 1912, approximately 100 feet uphill from these shafts, the Blue Moon shaft was sunk to a depth of 60 feet. By December, 1912, the shaft had been sunk to a depth of 100 feet, 150 feet of drift had been driven and 5 stopes were opened for production. The eastern drift was longer than the western drift and only a small amount of water had been encountered in the workings (Smith, 1913; B 525). Over the period extending from November, 1912 through the middle of 1913, the Pioneer Mining Company mill treated approximately 200 tons of ore from the Blue Moon shaft (Chapin, 1914). The ore ran $50 to $100 per ton in free milling gold (2.4 to 4.8 ounces of gold per ton).

The Pioneer Quartz Mining Company mill consisted of a five-stamp Joshua Hendy mill utilizing 1000 pound stamps dropping at a rate of 100 times per minute. The rock was trammed from the mine 300 feet to the northwest where it was screened with undersize going directly to the feed bins and oversize going through a Joshua Hendy jaw crusher. Minus 40 pulp from the stamps fed onto 20 feet of amalgamation plate which fed an amalgam trap and a 6-foot-long riffle box (Chapin, 1914). Tailings from the mill contained $0.50 to $3.00 per ton in gold (0.02 to 0.1 ounces of gold per ton). Stamp sand concentrates were not saved. By the summer of 1913, the mill had closed and the Blue Moon shaft was inaccessible (Chapin, 1914). In 1914, the mill was dismantled and moved to the Hi Yu mine (Stewart, 1922). By 1931, the shaft house had been torn down and the prospect was idle (Hill, 1933).