210 GEOLOGICAL RECONNOISSANCE 



which the Kellogg veins form a part, must have a width, in the same 

 direction, exceeding twelve miles. 



From 40 to 50 tons of silver-lead ore have been taken out of one of 

 the shafts sunk at the Kellogg mines, according to information derived 

 from Mr. Purdom, and one lump carried to Little Rock, as a sample, 

 weighed 108 pounds. In following the vein, this shaft was carried 108 feet 

 through shales (a) of the section, after which the work was abandoned. 

 The vein was found to contain more or less lead throughout the whole 

 depth. Another shaft, known as the " Well or Moreland diggings," passed 

 through 200 feet of the same shale, which still continued beneath. This 

 vein also afforded a considerable amount of argentiferous lead, associated 

 with the minerals before mentioned as belonging to this locality; but the 

 amount of ore taken out of this shaft could not be accurately ascertained. 

 Mr. Purdom was of opinion that it had not produced as much as the 108 

 feet, or " Johnson shaft." A large quantity of copper pyrites was found 

 amongst the rubbish thrown out of these shafts, and it is believed that 

 o-ood veins of this ore might be reached by following the veins. 



The lead and copper bearing shales of Kellogg creek are underlaid by 

 the subcarboniferous limestone, which, we have every reason to believe, 

 would be more favorable to mine in than the overlying shales; besides, 

 the surface indications of this system of veins give evidence, that the 

 deeper they are followed, the richer they become; for the quartz veins of 

 the Palarm, which I conceive to be an extension upwards of the veins of 

 Kellogg creek, have not as yet yielded any ore, either of lead or copper. 

 I believe it, therefore, to be a fair inference, that the deeper the veins are 

 followed, the richer they will become; more especially when they reach 

 rocks more favorable for the reception of ores. 



The analysis of two samples of lead, from the Kellogg mines, gave the 

 following result: No. 1, a bright crystalline looking ore, gave, by reduc- 

 tion, 81. 7 per cent, of metallic lead. By cupellation, this lead gave a 

 silver bead weighing 1.06' per cent, of the lead employed, which is equal 

 to 339.2 ounces of silver in a ton of 2.000 pounds. 



No. 2, a porous fine-grained ore, with particles of talc disseminated, 



gave 73.45 per cent, of metallic lead; this, by cupellation, gave 0.7 per 



cent, of silver, equal to 224 ounces in a ton of 2,000 pounds. 



The silver-lead ores of Great Britain and Ireland, 'worked in 1852, 

 according to Mr. Hunt, (as quoted in Whitney's " Metallic wealth of the 



United States),'' ranges as low as G ounces of silver in a ton of lead; the 

 highest, being that of Devon, contains 40 ounces of silver in a ton of lead. 

 The Cardiganshire and Montgomeryshire lead ores sometimes contain as 

 much as 75 or 80 ounces of silver to the ton. At Wildberg, in Prussia, 



