Ores are found under all conceivable conditions in Colorado, and, as a rule, in sufficient quantities to admit of their profitable extraction. In the metamorphosed granite mountains of the main range the typical fissure veins, with well-defined and nearly perpendicular walls, are found often aggregated in great numbers, and universally mineralized to a profitable degree. In the trachytic and porphyric districts rich fissures also prevail, running very high in silver as a rule, while occasionally the precious metals are associated with such quantities of lead or copper ore that the base metals more than pay all cost of mining and treating the ore. In other sections, again, where there have been large overflows of porphyry upon the carboniferous or silurian limestone, great deposits of silver lead ore are found, often covering many acres of ground like vast coal-beds. To this latter class belong the mines of Leadville, which in the past ten years have yielded over $100,000,000. Also the mines about Aspen, Robinson, Red Cliff, Monarch, White Pine, and Rico. Wherever the deposits, however, and whatever the character of the mineral, the result is the same--an increase in the wealth of the State where developed. A number of valuable and important discoveries of gold and silver have been made this year (1892). The enormous deposits of silver at Crede promise to make it a rival of Leadville, while the immense gold-fields at Cripple Creek, near the line of this road, will add millions of dollars to the yellow metal wealth of the country. Rico, in the San Juan country, will produce millions of dollars more this year than ever before in its history. The quantity of the precious metal and the prosperity of the mining sections are only measured by the energy of the communities themselves and the extent of the capital employed. The record of the mining industry last year can be gleaned in the subjoined table: 1889. 1890. Silver, ounces 21,119,613 25,788,819 Gold, " 194,908 4,016,229 Lead, tons 3,166,970 3,932,814 Copper, pounds 3,127,739 2,422,000 The estimate for 1889 does not include the metals contained in the ore shipped out of the State, while that for 1890 does include them.