The Moon occurrence is located in an area eight kilometres northeast of the townsite of Cassiar, about 108 kilometres north of the community of Dease Lake.

Peridotite of the Upper Paleozoic Sylvester Allochthon (Slide Mountain Complex) is altered to serpentinite near a rodingite dike. Silky chrysotile fibre up to 60 millimetres long has been reported to occur in ribbon veins.

In 1960, the Moon showing was reportedly discovered by W. Bridge, who formed a company called Northwest Asbestos Development Co. to explore it, but died before completing his plans. In 1961, Bridge's associate, B. Longhurst, backed by R.R. Kirwan, staked the Moon 1-9 claims, as well as Sun 1-4 on a float boulder occurrence. The claims were examined by Cassiar Asbestos Corp. and rejected. The owners performed some hand pitting. In 1962, the Moon showing was re-examined by Cassiar, which completed more hand trenching and a mill test. In 1963, the property was optioned and bulldozer trenched by Riocanex prospectors Morgan and Thorn. In 1964, the showing was examined by Nicolet Asbestos under an option. In 1965, the property was optioned by Canadian Johns-Manville, which did no additional exploration. In 1979, the Tanya 1-5 claims were staked by Cassiar Asbestos Corporation Ltd. (Cassiar Resources Ltd.) to cover the northern portion of an ultramafite body known to contain scattered asbestos mineralization. Geological mapping, picketing and bulldozer trenching was performed during 1980.