E/MJ : engineering and mining journal . NUCHLK ^ -^ mn, ^ jtiTfCS yflth 10^ SOVr^ MAP OF COUNTRY ALONG THE ALASKAN GOVERNMENT RAILROAD with pack horses. The information gained on theseexpeditions was such as to warrant further workto determine the extent of the promising ores consist of sulphides of copper, lead, zinc,and iron, with high silver and gold content. Silver isassociated with the lead sulphides, or carbonateswhere they have been formed by surface alteration,and the gold occurs with the copper. High assays ofsilver are common, and gold nins from a trace to. iJ^J^^ j^a^^
E/MJ : engineering and mining journal . NUCHLK ^ -^ mn, ^ jtiTfCS yflth 10^ SOVr^ MAP OF COUNTRY ALONG THE ALASKAN GOVERNMENT RAILROAD with pack horses. The information gained on theseexpeditions was such as to warrant further workto determine the extent of the promising ores consist of sulphides of copper, lead, zinc,and iron, with high silver and gold content. Silver isassociated with the lead sulphides, or carbonateswhere they have been formed by surface alteration,and the gold occurs with the copper. High assays ofsilver are common, and gold nins from a trace to. iJ^J^^ j^a^^«^«^;3^^^^<^ 2§afe?^ rt^ •? j!« AT MILE 260 OF THE GOVERNMENT RAILROAD. MARCH 6. 1919 Still, large quantities will require enrichment bysome of the standard concentration processes. Flota-tion probably will prove best adapted, as that processis fast displacing gravity methods on ores of asimilar character. On Partin Creek, ten miles from the Ohio Riverdistrict, a large copper-silver-gold-bearing vein oc-curs in limestone. Not far from here, on Coal Creek,I discovered a granite-slate contact with a wide zoneof massive pyrrhotite and sphalerite, carrying goldand silver. I have mentioned only a few of the typicalinstances of mineralization which came under myown observation, but many other occurrences areknown. Although little prospecting has been done,the mineralized area is known to extend abouttwenty-five miles from the headwater of the westfork to the head of Partin Creek, and almost noprospecting has been done outside of this and more thoro
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
