GEOLOGICAL EXPLORATIONS AND LITEKATUKE— 1S4U. 13 



Gray, A. B. Report by A. B. Gray. Ibid., pages lo-22. With map. 



Accompanying Stockton's report are the reports of liis several assist- 

 ants, among whom was A. B. Gray, who refers incidentally to the rocks 

 between Granite Point and the Chocolate River as "trap and granite, 

 bearing the strongest indication of a metalliferous nature" (p. 18). They 

 contain veins of galena, chalcopyrite, and pyrite. The traps and granites 

 appear as knobs, some of which "are based on the south In^ metamorphic 

 and sandstone rocks." With Gray's report is published a map of the west 

 half of Lake Si;perior, showing very well the main features of the topog- 

 raphy of the district lying between the Montreal and Chocolate ri\-ers, but 

 containing no geology. 



1846. 



Gray, A. B. Report of A. B. Gray relative to the mineral lands on Lake 

 Superior. Dated March 10, 1846. Transmitted to the House of Representatives 

 June 16, 1846. 29th Congress, 1st session, 1845-46. Executive Documents, Vol. VII, 

 No. 211. 23 pages. With map. 



In a second report, written al)out a year after that last referred to, Gray, 

 who in the meanwhile had been appointed assistant superintende;it, reports 

 the progress of his surveys of the Lake Superior mineral district, and gives 

 on a large-scale map the location of claims tiled by mineral prospectors. 

 It is interesting- to note that a large number of claims had been leased in 

 the district with which we are concerned at present, especially in T. 47 N., 

 R 26 W., and T. 47 N., R. 27 W., the two most important iron-producing 

 townships in Michigan, and that they had been taken up, not with a view to 

 prospect for iron ore, but, in all probability, in the hope that galena, copper, 

 or an ore of copper might be discovered on them. It is true that Sauuiel 

 Peck reported the existence of large exposures of specular iron ore in the 

 range of hills south of Dead River and about 10 or 12 miles inland, but it 

 is plain that a great deal less interest was taken in this discovery than in that 

 of galena on Dead River and near the Carp, of gold in the "iron range," 

 and of black oxide of copper at Presque Isle and near the mouth of the 

 Carp. 



