The second process was initiated by the uplifting of the mountain ranges to their present height, at which time the diorites, those ore indicators of the globe, uprose through the sedimentary strata. Thus was the original surface of deposit bent and folded, and not unfrequently entirely broken. The surface waters carrying free oxygen and free carbonic acid now penetrated along the contact, and oxidized the sulphurets, which formed free sulphuric acid, giving rise to the sulphates and sulpho-carbonates. The irresistible law of gravity distributed these sulphates, these oxides, and these carbonates in vast bonanzas, that have been the wonder of the world. The fossil trilobites of this region identify it with the silver lead districts of Nevada, Utah, and Mexico. It is not anomalous, but simply richer than its sister regions to the West and South. The output of ore from the Leadville mines last year (1879) aggregated 122,483 tons, which represents a value of $11,477,046. That is to say, there was an average yield at $90 per ton, or just $31,443.96 each day. On the first day of May of the present year (1880), the returns from thirty-seven of the leading mines gave a total daily output of 899½ tons of ore, yielding, at the low average of $90 per ton, something like $80,955 per day. The world's history of silver mining in the past shows nothing like this for so young a camp. Scarcely a month passes without opening up some new and vast carbonate deposits. The territory has not even been thoroughly prospected; and the future yield of the royal metal will far eclipse its past production.