THE GEOLOGICAL RELATIONS OF THE ATMOSPHERE. 605 



<df the ore. Two green carbonates, mixed with silica, respectively gave 

 13.72 per cent, and 17.69 per cent One specimen of green carbonate, 28.51 

 per cent. A number of red oxides ranging between 33 per cent, and 85 per 

 >cent. One of pure green carbonate gave 40.28 per cent. The average se- 

 Jected ores range from 20 per cent, to 30 per cent. A very large amount of 

 ore, probably 1,000 tons, is on hand, averaging 10 per cent., not shipped, 

 being considered too low a grade j but with proper handling could be smelted 

 at a profit. 



The Chicago Mine. — The Chicago mine is situated on the same hill, and is 

 almost identical in every respect with the Harris mine ; in fact, the above 

 description answers both, and I had both in my mind when writing this 

 report. This mine is much farther developed than the Harris mine, show- 

 ing the same character of ore. 



A number of drifts have been run into the hill to depths ranging from 

 50 to 165 feet, the ore gradually increasing in richness and quantity as the 

 hill is penetrated ; about 300 feet of drifts have been run, averaging a height 

 of 5|- feet and a width of 5 feet. 



The character of the ore and rock renders mining very easy ; and the 

 mixture of the carbonates, sulphurets and oxides are such as to make them 

 very desirable for smelting. These ores' are bought at a furnace at Ste. 

 Genevieve, the price paid being according to the percentage of the copper 

 -contained in the ore, ranging from $25 to $100 per ton, delivered in Ste. 

 Genevieve. To mine and deliver the ore, including all expenses, it costs 

 about $25 per ton. 



The roads are in fair order ; the road bed being partly of rock, but prin-^ 

 cipally of red clay. With a small outlay of money and work these roads 

 could be put in a good condition. At present a ton to a two-horse team ig 

 a fair load. 



The property consists of 80 acres (in fee simple) and the mining lease for 

 20 years, on about 250 acres of land, the whole tract being contained in hill 

 described, and no doubt underlaid by at least three, and probably four, ore 

 beds. 



From the lai-ge quantity of ore already proved to exist in the hill by 

 siuraerous tuntiels and shafts, the richness of the ores, the readiness with 

 which they are smelted, the facilities of transportation to market, and the 

 great demand for the ores, the property is of great value. 



Very Eespectfully, etc., Jas. E. Gage, 



THE GEOLOGICAL RELATIONS OF THE ATM.OSPHERE. 



The gaseous envelope which surrounds our globe plays a very consider- 

 able part in the chemical changes ever going on in rock formations, whether 

 actually at the surface — as in what is called the " weathering of rocks" — - 

 or in the less apparent, but perhaps more powerful, action carried on below 

 the surface. In a late number of the Quarterly Journal of Science, Edward 



