64 Copper Mines. [Jan., 



The company has aheady expended over fourteen thousand dol- 

 lars. 



Agate Harbor, on Keweena Point, and situated upon the coast, 

 as will be seen by reference to the map, has not been sufficiently 

 explored to determine its real value. Many veins of spar with 

 copper are seen traversing the trap and conglomerate, but the 

 vicinity is low and the underbrush extremely dense and difficult 

 to penetrate. 



At Easle river, the indications of a rich minino; field consist in 

 the great abundance of broken fragments of rich veins, which 

 are profusely scattered about. 



At the Great Montreal river, a great number of veins have 

 been discovered. These are situated, as usual, at the junction of 

 the trap and sandstone, or conglomerate. At one point, no less 

 than sixteen distinct veins have been discovered, all of which ex- 

 hibit masses of native copper. The matrix of these veins con- 

 sists of laumonite, carbonate of lime, prehnite, epidote and ser- 

 pentine. 



The Dead River location, a vein of copper ore occurs about 

 four feet and a half wide. It consists of green carbonate and 

 sulphuret of copper, filling small interstices in barytes w'hich 

 constitutes the gaugue. A specimen of the ore yielded twenty- 

 eight per cent of copper.* 



* As much interest is beginning to be felt by the community generally in the 

 mineral wealth of our country, the following extract in relation to the " Con- 

 solidated and United Mines," (at present the richest mines in Cornwall, Eng- 

 land) taken from the report of Captain G. \V. Hughes, of the United States 

 Topographical Corps, made to the Secretary of War, April 9th, 1844, may be 

 of some interest to our readers. 



Captain Hughes, \\hile on a tour in Europe, examined attentively many of 

 the mines in England, and has given a very full and satisfactory report, not 

 only of the nature of the mines, but also the manner of working them, and 

 of reducing and refining the metals : 



" Elevation of the surface above the level of the sea, from 200 to 300 feet ; 

 depth below the sea, about 1370 ; total depth of mine, 1500 to 1600 feet. 

 Ores — chiefly yellow copper ore, occasionally native copper, variegated copper 

 red oxide of copper, blue and green carbonate of copper; Tin ore or oxide of 

 tin also occurs, but not in very great abundance. Produce of the ores — 9| 



