50 



BULLETIN OF THE 



waters, and on this point wc arc in accord. In general they regard them 

 as peculiar to certain formations making a bed or set of beds in the 

 stratigraphical series below the ore formation proper, while we regard 

 them simply as local modifications of the ore formation of the region 

 occurring under certain conditions ; i. e. the conditions that led to the 

 shattering of the rock and gave the opportunity for the formation of 

 thermal springs. On one side of the Salisbury mine is the " diorite/' 

 while on the other comes a strong dike of diabase (p. 42). The "dio- 

 rite*' runs about east and west, while the strike of the diabase is about 

 N. 50° E. The latter is seen to be the younger rock, and the marks of its 

 passage through the ** diorite" hill can be seen a long distance off. The 

 relation of the two rocks is shown in the plan (Fig. 23), while the supposed 

 relation of the "diorite'* to the schist and ore is given in Figure 24. 



The Salisbury mine is located in the acute angle a, formed by 

 the two intrusives, at the point where the fracturing, breaking," and 

 shattering of the prior or ore formation was greatest, and where hot 

 springs would then most likely occur. The general structure of this 

 rcirion, the character of the ore and its associated kaolin, all confirm, in 

 our mind, this view. As the ore deposit formed under such conditions 

 is necessarily limited, it has become a matter of great importance to the 

 company working this mine to find a continuation of this ore, or a new 

 locality, before the old is completely worked out. The mining captain 

 informed me that the State Geologist, Dr. Rominger, in conformity with 

 his views and those of Messrs. Brooks, Kimball, and others, that the 

 diorite, diabase, jasper, hematite, and limonitc are distinct sedimentary 

 formations, advocated the sinking of pits at the points h, c, d, where 

 the formation would, by its foldings, again be brought up, and give the 

 same ore. The point h is located at the obtuse angle of the junction 

 of the diabase and diorite, therefore wc should not expect so much shat- 

 tering of the rock, nor so great likelihood of thermal springs. "Soft 

 hematite" would be expected to occur to some extent, but with too 

 much of the undecomposed jaspery rock to make it profitable mining. 

 Such was found to be the case ; therefore the theory of Messrs. Piomin- 

 ger. Brooks, and others fliilcd here. If the T.akc Angeline ore formation 

 extends cast along the northerly side of the "diorite" hill, the most 

 likely place to find a deposit of "soft hematite/' if our views are cor- 

 rect, would be at the point A, in the acute angle formed by the dia- 

 base with the " diorite," as it breaks through the latter. Unfortu- 

 nately this point is not on the property of the Salisbury mine, and it 

 slumbers in its primeval mud: 



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