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• <br />-~- <br />Paleontology <br />A paleontological inventory and assessment of the San Luis <br />resource Area was completed by contractor in December of <br />1983. The subject tract was designated as class 1B which <br />indicates the geological materials has a high potential for <br />scientifically significant fossils. These areas are to be <br />evaluated on a case by case basis prior to any surface <br />disturbing activity. The present author extensively <br />examined the surface of the tract as well as exposures in <br />the neighboring gravel pits (on 2-22-86). No evidence of <br />paleontological resorces was discovered during this <br />examination. I therefore change the classification from 1B <br />to 2. This classification is defined as the presence of <br />fossils of scientific value has not been established, and <br />is not anticipated. <br />The permit must contain the following stipulations to <br />protect potential paleontological resorces: <br />During operations on the permit, the permitee or his <br />contractors shall not knowingly disturb, alter, distroy, <br />or take any fossils of scientific value that may be <br />discovered. <br />2. The permitee or his contractors shall immediatly cease <br />sll operations upon discovery of fossils of scientific <br />value and immediatly notify the authorized officer. <br />The BLM shall evaluate the situation within 48 hours. <br />The BLM may negotiate additional time if mutually <br />agreeable between the BLM and the permitee. <br />3. The recovery of any fossils of scientific value will <br />be borne by the operator. <br />The potential exists for significant vertabrate fossils <br />from these deposits. An intensive examination gave no <br />indication of the presence of such fossils. <br />Mineral Deposits <br />The subject tract lies approximatly 2 Co 3 miles west of <br />the Crestone Mining District which occupies the flank of <br />the Sangre de Cristo range and extends into the Luis Maria <br />Baca number 4 land grant. Gold and silver was discovered in <br />the late 1890's but the most productive mines appear to have <br />been in the land grant. The mineralization in faults and <br />shear zones. paralleling the Sangre de Cristo fault. <br />The lifetime production (until the late 1930's) of the <br />district outside the land grant was 300 ounces of gold and <br />