(Rare types of tetrahedrite-tennantite ores of a gold ore deposit.

These sulphosalts occur as: 1) tiny segregations in sphalerite, galena and pyrite; 2) thin veinlets cutting these minerals; 3) rims on these minerals and 4) irregular intergrowths with chalcopyrite. Probe analyses of 23 grains shows that the Zn contents of these tetrahedrites and tennantites range 0.2-8.1%, with the Zn per formula unit often >1. Almost all samples contain Ag, several with Ag >2 wt.%; based on the As/Sb ratio, both argentian tennantite and argentian tetrahedrite occur. Goldfieldite-tetrahedrite solid solutions are also reported. High-tellurium tetrahedrite-tennantite and zincian tennantite contain Bi 0.1-1.2%, but one sample has Bi 10.9 wt.%, corresponding with annivite-tetrahedrite. Spectral reflectance curves and XRD data are reported.-R.A.H.