A 780-metre trenching program at Xanadu Mines’ Oyut Ulaan porphyry-copper-gold project in the South Gobi region has returned broad intervals with significant copper and gold assays. The trenches tested coincident geophysical and geochemical anomalies and identified three new mineralized porphyry centres under shallow cover.
Two trenches were excavated at Stockwork Hill, around 2km southwest of the initial Stockwork Hill reconnaissance drilling. One intersected an 85-metre section of mineralization grading 0.75% copper and 0.53 grams/tonne gold, including 33 metres @ 1.49% copper and 1.02 grams/tonne gold. The other, around 240 metres further west, intersected two mineralized zones, including 10.7 metres @ 0.36% copper and 20 metres @ 0.30% copper.
Another two trenches encountered disseminated mineralization hosted with strongly epidote-chlorite-magnetite-altered volcanic rocks. One of these intersected a 20-metre section of mineralization @ 1.02% copper and 0.18 grams/tonne gold.
The trenching program was completed at the time of the recent Diorite Hill drilling program. The intersected mineralization is characterized by high gold grades similar to those observed at Diorite Hill and coinciding with significant magnetic anomalies. A detailed structural and geological mapping of the surface expression of the new targets was also completed.
Xanadu’s managing director George Lloyd says: “These results greatly enhance our chances of discovering a second or third Diorite Hill at Oyut Ulaan. Xanadu will take a bolder approach to drilling in early 2014 as we seek to extend the depth and strike of Diorite Hill and test several new porphyry targets.”
There remain several untested geophysical and geochemical anomalies in the Oyut Ulaan licence area and the chances of discoveries in additional mineralized porphyry centres concealed under shallow cover are very good, according to company officials.