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Division; available at http://periodic.lanl.gov/images/periodictable.pdf. Cover.Photographs showing examples of sources and uses of zirconium and hafnium. Upper left, cube and crystal bars of highly pure zirconium metal (greater than 99.95 percent purity). Upper right, a pure (99.98 percent) melted tip of a hafnium electrode used in an electron beam remelting furnace for manufacturing metal parts; an oxidized hafnium electron beam remelted ingot; and a cubic centimeter of hafnium metal. Photographs by Heinrich Pniok (http://pse-mendelejew.de). Lower left, primary igneous zircon grains separated from granite. Lower middle, detrital zircon grains separated from metamorphosed sandstone. Lower right, baddeleyite crystals from the Palabora carbonatite deposit, Limpopo Province, South Africa. Photographs by Rob Lavinsky (www.iRocks.com).

Concentrically inward-dipping strata 2. Erosion along an encircling ring. 3. Anomalous radioactivity. 4. Goethite pseudomorphs and molds of pyrite. 5. Colloform celadonite~stained chalcedony. 6. Supergene Cu mineralization. 7. Breccia. 8. Anomalous concentrations in surface exposure of such trace elements as Ag, As, Cd, Co, Cr, Cu, Mo, Ni, Pb, Se, U, V, and Zn.Five rotary and core holes were drilled into this pipe. Drilling problems, such as lost circulation, lost casing into 30-foot-high caverns within the breccia, and great water consumption, limited the drilling results. Core recovered from holes in the center of the pipe shows breccia to the total depth of 1010 ft, abundant pyrite, and minor galena. Gamma logs of a rotary hole penetrating to 1335 ft (no cuttings were obtained below 1000 ft) show a one-foot interval of 0.52% eu 3 o 8 at a depth of 1191 ft, and a 20 ft zone averaging 0.04% eU 3 0A; this is at the same stratigraphic level as the . tops of orebodies in mines located on similar plateaus capped with the Harrisburg Gypsifetous Member of the Kai bab Limestone. Sufficient mineralization was verified in the Mohawk Canyon pipe that further drilling is warranted to assess its economic potential.

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