The recovery of multi-ounce grades from adits has prompted
The 2,000-metre program will try to delineate the Boka 1 zone and determine if it connects to the Boka 8 prospect, 3 km to the east. A government agency had been mining a portion of Boka 1 since early 2001.
Values from individual channel samples vary from less than a gram per tonne each of gold and silver to more than 374 grams gold and 117 grams silver. The highest grades came from tunnel XG-15, which averaged 75.2 grams gold and 25.3 grams silver over 34.5 metres of Boka 1’s strike length.
Results from another six adits are pending, and sampling of other tunnels continues.
To date, Boka 1 has been traced for 1.4 km along strike and for 200 metres downdip. The zone is divided into northern and southern sections that are exposed by a west-facing slope for 150 metres vertically.
Mineralization is associated with quartz-pyrite alteration and with ductile-brittle shearing caused by regional faulting. The host stratigraphic horizon, consisting of calcareous shales and siltstones of the Middle Proterozic Heishan formation, strikes to the north and dips to the east.
Coarse and fine native gold have been observed, and all the samples were strongly oxidized.
The Vancouver-based junior can acquire a 90% interest in the 99-sq.-km property by spending US$4 million over the next four years and paying US$1.7 million in the final year. China Yunnan Province Nuclear Industry Team 209 retains a 10% carried interest.
Southwestern also has exploration rights to 560 sq. km of surrounding ground. That concession includes two new showings that were discovered 3 km north of Boka 1, in the same stratigraphic horizon.
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