The Mexican mining journal . nes. From this pe-riod the work of clearing and restoration progressedsteadily, until by the end of 1829, the drainage hadbeen effected to the depth of 324 ft. below the adit. The actual cost of pumping did not exceed $30,000per annum, being an immense saving as comparedwith the large sum of $250,000 which the 28 malacatesformerly employed for this purpose had cost the secondConde, when at the same depth he had abandoned thelower workings. It, however, soon became evident that the drainageat the distant points of San Cayetano and Doloreswas not sufficiently effecti
The Mexican mining journal . nes. From this pe-riod the work of clearing and restoration progressedsteadily, until by the end of 1829, the drainage hadbeen effected to the depth of 324 ft. below the adit. The actual cost of pumping did not exceed $30,000per annum, being an immense saving as comparedwith the large sum of $250,000 which the 28 malacatesformerly employed for this purpose had cost the secondConde, when at the same depth he had abandoned thelower workings. It, however, soon became evident that the drainageat the distant points of San Cayetano and Doloreswas not sufficiently effective for working the richestportions of the vein in the mine of Santa Teresa, anda new vertical shaft was consequently sunk and a morepowerful engine erected. An engine with a (Cornish pump engine) having been erected,and assisted by the smaller ones at Dolores and SanCayetano, this portion of the Vizcaina vein was workedfor some time with considerable profit, and to the May. 1916. THE MEXICAN MINING JOURNAL 190. Mine Buildings, Pachuca depth of 1410 ft- from the surface, and 720 ft. belowthe level of the adit. At this level the water havingso increased as to again exceed its capacity, a stilllarger engine of 75-in. was erected at Dolores. (Thisengine was in continual use up to 1908.) The rewardof this expenditure was two large bodies of rich ore,the one on the Santa Erigida vein, near the Acostamine, and called La Luz, and the other at San Enriqueon the Vizcaína vein, near Dolores. Cornish Pumps. Up to the end of 1847, however, the general resultof working the mines had been decidedly unfortunateto the English investors, for although they had pro-fited by three rich bodies of ore at Terreros, Acostaand Dolores, which had produced $10,481,475 worthof silver, the outlay on all the undertakings of thecompany had also reached the amount of $15,381,683—leaving a loss of nearly $5,000,000 as the result of the23 years they had held the mines. ihe deep workings were no
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