RE: Epithermal gold4 Feb 2025 13:52
Https://pubs.geoscienceworld.org/segweb/economicgeology/article/119/3/525/637169/Epithermal-Gold-Discoveries-in-the-Emerging
In 2015, prospecting led Erdene to identify anomalous gold at the Bayan Khundii project, ~16 km southeast of Altan Nar, with surface rock chip samples returning up to >4,000 g/t Au (Erdene, 2015a1). Drill targeting was assisted by an IP survey despite the low sulfide content in most of the deposit, with high resistivity outlining zones of strong silicification. Results from the initial drill program at Bayan Khundii included a 7-m interval of 27.5 g/t Au from 14-m depth (Erdene, 2015b1). Subsequent exploration in the area led Erdene to discover gold mineralization at the Khar Mori (“Dark Horse”) project in early 2021, ~3 km north of the Bayan Khundii gold deposit (Erdene, 2021a1). One drill hole (AAD-58) intersected a 45-m interval of 5.97 g/t Au, beginning at 10-m depth. Later in 2021, gold mineralization was discovered in the southeastern corner of the Ulaan exploration license, called Ulaan Southeast, located approximately 800 m west of the Bayan Khundii gold deposit (Erdene 20211). One hole (UDH-10) from the maiden drill program intersected a 258-m interval which averaged 0.98 g/t Au from 92 m downhole. Subsequent drilling intersected the widest auriferous zones to date in the Khundii metallogenic province, with one 364-m interval averaging 0.79 g/t Au (including 91 m at 1.98 g/t Au).
An updated feasibility study was completed in 2023 for the Bayan Khundii gold deposit (Lawrence, 2023) based on 375 drill holes spaced at 10 to 25 m for a total of 56,249 m. The measured and indicated resource of 613,000 ounces of gold has an average grade of 2.58 g/t Au. Included within this are proven and probable reserves of 464,900 ounces gold at an average grade of 3.8 g/t Au; development has commenced.
Recent exploration in the Khundii metallogenic province by Mongolia Minerals Corporation and Steppe Gold has included geochemical and geophysical surveys, with several precious and base metal prospects announced in the Khongor and Uudam Khundii exploration licenses, respectively. Interest is increasing in this province, which is still underexplored.