Mineral resources . X. e D9 this lode was only a portion of the activities concerned in the Boppy lodeformation. Plate XII shows the quartz veins, with included slate fragments,and the associated mass of chert or allied material which appears to havebeen formed at the expense of the slate country. Plate XI and Pigs. 4 and 3 (&) also illustrate this association of quartzand chert or impure silica in a decided manner, and suggest that thequartz bodies represent the filling of a fissure, or a network of fissures, andthat the impure and more waxy silica has resulted from the replacementof the
Mineral resources . X. e D9 this lode was only a portion of the activities concerned in the Boppy lodeformation. Plate XII shows the quartz veins, with included slate fragments,and the associated mass of chert or allied material which appears to havebeen formed at the expense of the slate country. Plate XI and Pigs. 4 and 3 (&) also illustrate this association of quartzand chert or impure silica in a decided manner, and suggest that thequartz bodies represent the filling of a fissure, or a network of fissures, andthat the impure and more waxy silica has resulted from the replacementof the slate in the vicinity of the fissure or fissures. An examination indetail of the lode tends to confirm this idea. Thus, in Plate X, anapparent breccia is figured, in which the cementing material is, in part,ordinary quartz, and, in part, waxy silica of impure nature. All transitionsbetween this apparent slate breccia with a silica cement and a mass of waxyquartz, traversed by quartz veinlets, are to be found. The o
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
