Wisconsin. Chief Geologist / Geology of Wisconsin. Survey of 1873-1879 ...
Volume III (1880)
Chapter I. Menominee iron range, pp. -689 PDF (8.1 MB)
The Breen mine also presents some interesting points. One in nind occurred in the opening of one of the pits. After removing some three feet of earth there was exposed a vein of soft specular blue ore, twentv feet or more in width. It was plainly bedded and had a slaty structure. Its strike of nearly east and west, and dip of 600 to the southb, exactly coincided with that of the formation as exposed in the other openings; bnt after mining down only a few feet, they unexpectedly came upon horizontally bedded sandstone. The ends of the slaty ore were angular and well joined to the sandstone below. For a moment it appeared almost unaccountable, for here was an older rock, apparently in place, overlying a younger one, without a chance of explaining it by an overturned dip. A large piece of slaty ore, near by, imbedded in the sandstone, having a reverse dip to this larger mnass, furnished, to my mind, the probable key to the phenomenon. It would seem that during the deposition of the sandstone these ferrugrinous schists and other mein- bers of this series, dipping to the south, formed an abrupt cliff with the waters of the Silurian sea beating against which, in time, under- ained a portion of the faco, thereby causing a slide and breaking off of the projecting massos. In this manner, some of the sliding por- tions, with their lower ends buried in the sands, would appear un- disturbed. During the past winter and spring considerable excitement was gotten up over the reported discovery of gold and silver, associated with the iron ore of the Emmett mine. Several assays were iuade, some, it is said, with fair results. Gold seekers and adventurers flocked in from different parts of the country. The officers of the Emmett mine, at that time, ordered their agents in Cleveland to dis- continue the sales of their ore; but after a brief period the iron rod again resumed its sway and the golden sceptre was laid aside. On the same range, six miles to the west of Waucedah, is the Vul- can mine. The mining operations here are more extensive than at the Breen or Emmett mines. The old workings are located near the west quarter post of Sec. 10, T. 39, It. 29, Mich., and are on the south edge of a broad ridge _which admits of gr o o d drainage. The ore occurs - - e = in lenticular shaped, pock- <- - - c-- - et-like masses, something after the manner shown AS CALi6L&s ~ - in the annexed cut. It will be noticed that this 669 ECONOMIC.
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