As long as the gulches yielded a fair return in gold there was no so-called hard rock mining. Prospectors wandered over the hills, sampling the surface veins. The Atlantic and the Pacific, east and west of town, were located in 1861, also the Langston, but no development work was done. The next year the Locke lode, later called the Mountain Key, was discovered and years later became one of the richest producers. Surface ores were treated in 75 arrastras during the war years. Crude furnaces were used for the smelting of silver. Pinos Altos gold contains both silver and lead so has never received the highest price, being regarded at 70 per cent fine. In July of 1866 Virgil Marton brought the first stamp mill by oxen from St. Louis, also a saw mill. Both were kept busy, one crushing the surface ores and the other cutting mining timbers and lumber for buildings from the heavy stand of pine and juniper adjacent to the camp. After transportation and other costs were deducted, he and his associates averaged $10.00 a day each from the investment and labor. Big money in those days. The next mines of importance to be located were the Aztec, Asiatic, Ohio, Mina Grande, Pacific No. 2, all west of town, and the Golden Giant which was practically in town. During ’68 and ’69 the Pacific alone furnished ores for 31 stamps and the product surpassed all expectations. From a geological point of view most of the gold bearing ores belong to the Cambrian period. A porphyritic dyke runs along the Pacific slope and tends to change the direction of the veins of ore. There is much malpais to the north and east but the old-timers believed that gold bearing rock lay underneath. John and Jacob Long found that to be true when they discovered rich veins that had been exposed by erosion. They called their claims the Osceola Group. They opened a shaft 60 feet deep and drifted along the vein for 70 feet, realizing from $50.00 to $400.00 a ton. The Atlantic and the Deep Down which adjoin the Osceola proved that rich ores were underneath the malpais. The mines were not deep nor were the mining methods legitimate. The lead would be followed, hoping it would join another vein where the richest ore would be found. It was “gophered” out. Under the surface the quartz changed to base or sulphuric ores which could not be successfully treated with stamps. Peter Wagner erected a five-stamp mill and a concentrator, the first which could treat base ores.