Proceedings of Annual Meeting 20
Proceedings of Annual Meeting 20
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North of the iron formation is a black slate, 'and beyond this, the trap rock. Cutting through these formations are numerous diorite and diabase dykes, which generally dip at right angles to the footwall, and pitch downward toward the east, though there are several cases where the pitch is toward the west. The footwall quartz- ite, the ferruginous slates and the dykes are generally im- pervious to water. The largest orebodies are usually found in the troughs formed where the dykes cut through t...hese two other strata.
From the uniformity with which these formations run, development work generally consists of drifting on the foot- wall, with occasional crosscuts throiigh the ferruginous slates and raises wherever it is possible to find a trough formed by a dyke and the two other formations. Wherever orebodies occur in these troughs, the ore will usually be a soft ore, and the large bodies of the district are of this nature. In some Digitized by LjOOQiC LAKE SUPERIOR MINING INSTITUTE 55 mines the bodies occur as narrow veins, lying either on the quartzite or on the slate.
What to read after Proceedings of Annual Meeting 20?
You can find similar books in the "Read Also" column, or choose other free books by Lake Superior Mining Institute to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
North of the iron formation is a black slate, 'and beyond this, the trap rock. Cutting through these formations are numerous diorite and diabase dykes, which generally dip at right angles to the footwall, and pitch downward toward the east, though there are several cases where the pitch is toward the west. The footwall quartz- ite, the ferruginous slates and the dykes are generally im- pervious to water. The largest orebodies are usually found in the troughs formed where the dykes cut through t...hese two other strata.
From the uniformity with which these formations run, development work generally consists of drifting on the foot- wall, with occasional crosscuts throiigh the ferruginous slates and raises wherever it is possible to find a trough formed by a dyke and the two other formations. Wherever orebodies occur in these troughs, the ore will usually be a soft ore, and the large bodies of the district are of this nature. In some Digitized by LjOOQiC LAKE SUPERIOR MINING INSTITUTE 55 mines the bodies occur as narrow veins, lying either on the quartzite or on the slate.
What to read after Proceedings of Annual Meeting 20?
You can find similar books in the "Read Also" column, or choose other free books by Lake Superior Mining Institute to read onlineMoreLess
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