Transactions . that depth. Assays of three samplesare appended: — Oswego Ironworks, (I.) (2) Per Cent. Jer Out. lion 67*250 64*970 Silica 2-040 4-810 Phosphorus ... 0;258 0*155 Sulphur 0-232 0-182 Trail Smeller, Iron ...Silica ... Gold ... (3.)Per Cent. 02-104 00 Ounce. 0 02 MINING DISTRK TS OF BRJTISH COLUMBIA. 371 Due north of this mine lie the Trent and some other claims in whichcopper occurs in the same kind of rocks, which at one period wereevidently united to those of Cherry Bluff. Cinnabar and copper alsocur there in dolomite. The granite, wherever it carries copper, is con
Transactions . that depth. Assays of three samplesare appended: — Oswego Ironworks, (I.) (2) Per Cent. Jer Out. lion 67*250 64*970 Silica 2-040 4-810 Phosphorus ... 0;258 0*155 Sulphur 0-232 0-182 Trail Smeller, Iron ...Silica ... Gold ... (3.)Per Cent. 02-104 00 Ounce. 0 02 MINING DISTRK TS OF BRJTISH COLUMBIA. 371 Due north of this mine lie the Trent and some other claims in whichcopper occurs in the same kind of rocks, which at one period wereevidently united to those of Cherry Bluff. Cinnabar and copper alsocur there in dolomite. The granite, wherever it carries copper, is con-siderably altered and traversed by veins of dolomite and lime. On theTrent claim, the principal deposits of copper seem to run irregularlythrough zones of decomposed granite, which are heavily charged withiron-pyrites. The strike is north and south, the dip being nearly vertical,and their character is somewhat altered where they are crossed by thecalcareous veins, which lie nearly flat (Fig. 5, Plate XIIL).. Fig. 12.—View of Aerial Cable-way of the Glen Iron-mine. Before leaving this area of gabbros and diorites, the writer may saythat it would seem as if all the ore-deposits in them are veins of replace-ment, the vein-filling of which has been deposited by thermal watersrising along the line of fissures in the gabbro and kindred rocks. Thesewaters would replace the calcareous components of the country-rock byoxides of iron, which were probably derived from the pyroxene of thesame rocks. The copper would be obtained from volcanic rocks in thedistrict. Hornblende and labradorite would provide a large quantity oflime, and would thus be largely the source of the calcareous veins. Magne- 372 MINING DISTRICTS OF BEITISH COLUMBIA. tite occurs in grains disseminated through the rocks of Cherry Bluff. Theveins usually have one well defined wall, which is the line of the originalfissure through which the heated vapours ascended, one wall being indis-tinct, and the scanty evidence w
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1887
