- News Releases
Erdene geologists discovered Bayan Khundii in Q2-2015 during a regional reconnaissance program over Erdene’s 100%-owned Khundii exploration license. An initial exploration program was completed in Q2/Q3 consisting of rock chip/grab sampling, trenching and geological mapping over a 1.4 km long zone of intensely silicified and sericitized volcanic units. The majority of the rock samples returned highly anomalous values with over 20% of the samples returning values in excess of 3.0 g/t gold (up to 4380 g/t gold). The follow-up trenching program was equally successful, demonstrating wide zones of lower grade gold mineralization in the wall rock (30m of 2.7 g/t gold) and confirmed the intensity of mineralization in high-grade veins (1m of 55 g/t gold).
Bayan Khundii is located in southwest Mongolia within the Tian Shan Gold Belt, 160 km from the Mongolia-China border. Mean elevation is 1200 m (4000 ft).
Bayan Khundii lies within the Trans Altay terrane, part of the Central Asian Orogeny, and consists of 2 separate zones of mineralized and intensely silicified and sericitized volcanic units over a 1.4 km strike length. Mineralization consists of quartz and/or hematite breccia and comb-quartz veins within pervasive silica and sericite altered volcanic and volcaniclastic host rocks, including pyroclastic units and ignimbrite, with extensive hypogene hematite veins and fractures. Visible gold was observed on surface in multiple samples, and within 10 of the 15 drill holes completed, as irregular-shaped grains, up to 2mm. Gold mineralization is associated with quartz veins and/or hematite within, or along, the boundary of quartz-hematite veins and veinlets. Gold is also present as very finely disseminated grains, and rarely as fracture in-fillings within intensely sericitized and silicified volcanic host rocks. The intensely altered host volcanic units also carry anomalous gold mineralization (varying from 0.1 to 1.0 g/t gold over wide areas) associated with narrow quartz and/or hematite veinlets. The strong, pervasive alteration and widespread hypogene hematite mineralization are indicative of a large intense alteration system. This has positive implications for the potential size of the system. Erdene completed an induced polarization geophysical program over the Bayan Khundii prospect in Q4 2015 that suggests the mineralization is located at the apex of broad positive chargeability and resistivity anomalies.
The maiden drill program commenced on November 8, 2015 and consisted of 15 angled (45 to 60 degrees) large diameter diamond drill holes (‘PQ’ size core; 85mm), totaling 695 metres. Drill hole depth ranged from 31 m to 70 m (average 46 m) with maximum vertical depth tested of approximately 50 m. The program only tested BK-Central.
Gold mineralization was confirmed through drilling in multiple structures, orientated perpendicular to a 475 m long, silicified zone that remains open along a northeast trend. These perpendicular structures are commonly host to high-grade comb-quartz veins and quartz breccias within a lower grade envelope of pervasive silica and sericite altered, volcanic host rocks with extensive hypogene hematite within veins and along fractures, and as matrix material in hematite breccias. Visible gold was observed in 10 of 15 holes within a number of quartz veins as irregular shaped grains (up to 2 mm), and also as high-grade disseminations and fracture fillings. A general absence of sulphide mineralization was noted in all of the holes, with the exception of rare disseminated pyrite and minor pyrite in quartz veins. The main mineralized veins are interpreted to dip at 40 to 50 degrees to the southwest.
Mineralization within the Striker Zone (northeast portion of BK-Central) included;
Hole BKD-10 was collared 60 m southeast of hole BKD-09, indicating excellent continuity.
See sidebar for plan maps and cross-sections.
See the Company's press release section and corporate presentation section for the latest updates on drilling and plans at Bayan Khundii.