| comparative study from colleagues, institutes, and mines; many samples were collected by the writer himself...numerous associations of lead + zinc, of cobalt -f- nickel + silver -f arsenic + bismuth + uranium, and, to...places of extreme differentiation (e.g., at the Frood Mine and at Insizwa) bismuth and tellurium minerals are...are withdrawn from the magma: platinum, chromium, nickel (in olivine and in sulphides) a part of the iron...(1940). 12 T H E ORE MINERALS FIG. 4 80 X Mouat Mine, Stillwater Valley, Montana RAMDOHR From a border |
