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Mineral Appraisal of State Lands Within the Navajo Indian

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Mineral Appraisal of State Lands Within the Navajo Indian REPORT OF INVESTIGATION NO. 21 UTAH GEOLOGICAL AND. MINERALOGICAL SURVEY MINERAL APPRAISAL OF STATE LANDS WITHIN THE NAVAJO INDIAN RESERVATION, SAN JUAN COUNTY, UTAH and comparison with MINERAL APPRAISAL OF POSSIBLE EXCHANGE LANDS IN GRAND AND SAN JUAN COUNTIES, UTAH by Robert E. Cohenour December 21, 1965 Prepared at the request of the Utah State··land Board Summary and Recommendations The exchange of 31,371.65 acres of State lands within the Navajo Indian Reserva tion in San Juan County for 31,213.29 acres of selected government lands within Grand and San Juan Counties is recommended. The mineral potential, not the dollar value, of the State lands is rated as 1/2 the mineral potential of the selected government lands. Since none of the lands, either within the Indian Reservation or those selected for exchange, has any known recorded mineral production it would be impossible to attach a realistic dollar value to them. There­ fore the comparison of the lands has been made by mineral potential as summarized on the following table. Table I-COMPARATIVE MINERAL POTENTIAL Acres with Acres with· Acres with Gas Total Acres Urani urn Potentia l Potash Potential & Oil Potential State Lands on Indian Reservation to 31,371.65 8,136.00 zero 31,371.65 be Exchanged Government Lands to be 31,213.29 16,124.68 31,213.29 31,213.29 Acquired The breakdown of mineral potential, summarized in Table II, is explained as follows: 1. Uranium potential weighs slightly in favor of the government lands beca use a large proportion of the government lands are on structural trends within an area noted for large uraniferous ore bodies, and contain more strata capable of containing uranium mineralization than are present in State lands on the Navajo reservation. Howe ver most of the fa vorable strata are very deep and as a result the potential is poor. 2 . Potash potentia 1 weighs in favor of the government land I beca use there is no potash or sa line facies of the Paradox sa It zone present beneath the State lands on the Indian Re serva tion I wherea s the Paradox sa Lt zone is everywhere present on the government lands considered for exchange. Much of the government land is defin itely above the potash zone i but some of the government lands are on fringes of the potash zone and are assigned a poor status, rather than "no potential" because there is a general paucity of subsurface information in the marginal area. In the development of potash other factors must be considered, among them is the a vailabiLity of water for solution mining of potash and other soluable salts, because these beds lie between 3500-4500 feet beneath-t~ sur­ face, and possibly deeper" which limits conventional mining. The water s itua tion on the Colorado River is such that unless water can be released for deep solution mining the present potash value based on present mining technology is zero. 3. Oil and gas potential weighs in favor of the government land, although there is oil and gas potential over all lands of both catagories. However, almost 3/4 of the State lands have poor potential whereas about 3/4 of the Federal lands have good to very good potential. Thus the selected government lands are along petroleum trends on or near well defined structures. The State lands, though some are on structures, are not extensions of recognized petroleum trends and there are no nearby oil shows or seeps. There is a general absence of subsurface infor­ mation from nearby wells on all parcels of State and Federal lands with the exception of those government lands on Bluff Bench in T. 40S, R. 21 and 22E, where there are we ll-defined oil and ga s shows on adj acen t properties. The value of the government lands js at least twice that of the Sta te . Table II-COMPARISONS O¥.. MINERAL POTENTIAL Sta te la nds on Selected Government Na vaj 0 Reservation lands for· Exchange Uranium Acres Acres None 23,235.65 15,088.61 Poor o 7,635.00 Fair 4,254.08 5,534.72 Good 3,881.92 2,954.96 Tota l Acre s with Urani urn Potentia l 8,136.00 16,124.68 Potash None 31,371065, 0 Poor 0 9,549.96 Fair 0 21,663.33 Good 0 0 Excellent 0 0 Total Acres with Potash Potential 0 31,213.29 Oil & Gas Poor 24,343.45 o Fair 2,553.60 o Good 3,834.60 6,994.96 Very good o 22,538.33 Excellent 640.00 1,680.00 Tota 1 Acre s wi th Oil & Gas Potential 31,371.65 31,213.29 The detailed report follows: TABLE OF CON,TENTS Pages Summary 1-3 Appraisal of State lands on the Navajo Indian Reservation Reservation, San Juan County 4-19 Appraisal of Selected Government Lands in Grand and San Juan Counties 20-25 APPRAISAL OF STATE LANDS WITHIN THE NAVAJO INDIAN RESERVATION SAN JUAN COUNTY I UTAH T. 41 SOl R. 13 E. Section 16 -- 640.00 acres Physiography - upland desert Elevation 5600 feet. Rocky mesa - irregular. Access i.s poor .. Geology Surface - Jurassic Navajo (50%) and Kayenta (50%) Sandstones. Potential 2 miles southerly from Whirlwind Mine (uranium) - fair potential but ex­ tenSively prospected in 1950 1 s .. 1~ miles northeast of Moonlight Wash anticlinal nose - oil and gas poten­ tial fair to good" No water .. Section 32 -- 640 .. 00 acres Physiography - upland desert Elevation 4000 to 4200 feetG In steepwalled canyon - Copper Canyon Access is poor 0 Geology Surface - Trias sic Moenkopi Formation (25%) p Shinarump Conglomerate (75%) • Potential Copper Canyon - connotates mineralization and since copper and uranium are commonly associated in some of the channel uranium deposits I the uranium potential is fair to good 0 Land is straddle the Moonlight Wa shanticlinal nose - potential good to excellent .. Section 36 -- 640000 acres PhYSiography - upland desert Elevation 4100 feet. Rocky gulch. Good - road to Whirlwind Mine passes over land 0 Geology Surface - Permian Cedar Mesa Sandstone (100%) • 4 Potential No uranium potential - productive strata eroded" Oil and ga s potential is poor - area is in synclinal trend between' Moon-~ light Wash and Organ Rock anticlines" Section 2, Lots 102030 4 o StNto st -- 634060 acres 0 PhYSiography - upland desert Elevation 4400 feet .. Rocky mesa 0 Acces spoor e Geology Surface - Permian Cedar Mesa Sandstone (100%) • Potential Uranium - none 0 Oil and gas potential - fair to good - axis of Organ Rock anticline cros,ses NE corner of section 0 Section 16 -- 640000 acres PhYSiography - upland desert Elevation 4200 feet" Rocky mesa 0 Access poor .. Geology Surface - Permian Cedar Mesa Sandstone (100%) • Potential Uranium - none" Oil and gas - poor. Section 32 -- 640" 00 acres PhYSiography - upland desert Elevation 4400 feet" Rocky mesa .. Access - poor" Geology Surface - Permian Cedar Mesa Sandstone (100%) 0 Potential Uranium - none 0 Oil and gas - poor. 5 Section 36 -- 640000 acres Physiography - upland desert Elevation 4600 feet. Rocky mesa. Access - fair. Geology Surface - Permian Cedar Mesa Sandstone (l 00%) • Potential Uranium - none. Oil and gas - potential good - axis of Organ Rock anticline traverses section from north to south. T. 41 S., R. 15 E. Section 2, Lots 1, 2,3,4, StNtg st - 638.72 acres Physiography - upland desert Elevation 4800 feet. Rocky mesa. Acces s - poor. Geology Surface - Permian Cedar Mesa S-andstone (100%) • Potential Uranium - none. Oil and ga s - poor. Section 16 -- 640.00 acres Physiography - upland desert Elevation 4700 feet. Rocky mesa. Access - poor. Geology Surface - Permian Cedar Mesa Sandstone (100%) • Potential Uranium - none. Oil and gas - poor. Section 32 -- 640.00 acres Physiography - upland desert Elevation 4650 feet. Rocky mesa. Access - poor. 6 Geology Surface - Permian Cedar Mesa Sandstone (100%). Potential Uranium - none. Oil and gas - poor. Section 36 -- 640.00 acres Physiography - upland desert Elevation 5200 feet. Rocky mesa. Access - poor. Geology Surface - Permian Cedar Mesa Sandstone (100%) • Potential Uranium - none. Oil and gas - poor. T.41S.,R.16E. Section 2, Lots 1,2,3,4, stNi, st -- 636.08 acres Physiography - upland desert Eleva tion 5400 feet. Rocky mesa. Access - poor. Geology Surface - Permian Cedar Mesa Sandstone (100%) • Potential Uranium - none. Oil and gas - fair, 2 miles SW of axis of Slickhorn Gulch anticline. Section 16 -- 640.00 acres Physiography - upland desert Elevation 5400 feet. Rocky mesa. Access - poor. Geology Surface - Permian Cedar Mesa Sandstone (100%) • Potential Uranium - none. Oil and gas - poor. 7 Section 32 -- 640.00 acres Physiography - upland desert Elevation 5400 feet 0 Rocky mesa. Access - poor 0 Geology Surface - thin colluvial. (rocky) cover over Permian Cedar Mesa Sand­ stone. Potential Uranium - none 0 Oil and gas - poor. Section 36 - 640.00 acres Physiography - upland desert Elevation 5600 feet. Rocky mesa. Acces s - poor .. Geology Surface - thin colluvial cover (50%) over Permian Cedar Mesa Sand­ stone. Potential Uranium - none. Oil and gas - poor. T.42S.,R.IIE. Section 32 -- 640.00 acres Physiography - upland desert Elevation 5000 feet. Rocky mesa. Access - poor. Geology Surface - Colluvium I 10%; Jurassic Navajo Sandstone, 75%; and Triassic-Jurassic Kayenta Formation, 15%. West half of section contains 2 north-trending normal faults of small displqcement. Potential Uranium - fair to poor - Shinarump Conglomerate if present is 1,000 feet below the surface. Oil and gas - poor. 8 T. 42 S., R. 12 E. Section 16 -- 640.00 acres Physiography - upland desert Elevation 4800 to 5800 feet. North-south cliff line in western half of section. Access - poor. Geology Surface - Jurassic-Triassic Kayenta Formation 10%; Triassic Wingate Sandstone, 10%; Triassic Chinle Formation, 80%.
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