Sangdong mine

Sangdong mine

Site area KTMC period (Old adit of Taebaek Level, 684m)
Location
Yeongwol County, Gangwon Province
Country	South Korea
Coordinates	37°9′N 128°50′E
Production
Products	Tungsten
Type	Open-stope
History
Discovered	1916
Active	1930–1994, and 2024–present
Owner
Company	Almonty Korea Tungsten
Website	www.almontykorea.co.kr
Year of acquisition	2001

The Sangdong mine located in South Korea is one of the largest tungsten mines in the world. The mine is located 187 km southeast of Seoul, approximately three hours’ drive via expressways and local sealed highways. Temperatures rise to a maximum of about 30 °C during the wet summer months of June to August. The winter period is relatively dry and extends from October to March, with freezing temperatures occurring during the period December to March.

Sangdong Mine had been a main business station for tungsten concentrate production of Korea Tungsten Mining Co.Ltd ("KTMC") with large scale and high quality of Sangdong tungsten production (the principal potential products were tungsten and molybdenum) that was the driving force of South Korean economic development since post-Korean War. At the time of exporting of Sangdong tungsten products to USA in 1947, the institute of analysis and research in USA announced "Korean tungsten quality is outstanding and it is the global standard in the tungsten market".

After a decade from mine closure of KTMC in 1994, mining rights of Sangdong mine were acquired by Woulfe Mining Corporation via Sewoo Mining Corporation in 2006 and established its wholly owned subsidiary, Almonty Korea Tungsten Corporation (ex-Sangdong Mining Corporation). Almonty Industries, specializing in tungsten projects with operation mine in Spain, Australia and Portugal, completes the acquisition of Woulfe Mining Corporation in September 2015. All information and data along with many detail investigation and analysis about Sangdong mine which had been closed for over 15 years were well organized and summarized in the "Feasibility study" and "NI 43-101 Technical report" drawn up by Almonty Industries.

Holding ceremony for completion KTMC APT Plant

Entrance to sangdong mine in winter season

Main Office of Sangdong mine

Scheelite ore of sangdong mine

Spiritual Rock in Sangdong Town

History

The discovery of first outcrop of Sangdong Mine was in April 1916. Tungsten mineral had increased in value with the outbreak of World War I and had been developed and mined by Japanese mining company (Solim Mining Corporation) until Korean independence in 1945. And in the post-Korean War decades, Sangdong mine was the powerhouse of the economy contributing more than 50% of the country's export revenue as one of the largest global tungsten producer. But as all other metallic mine in South Korea, Sangdong Mine also fell into the way of closing primarily due to low commodity prices along with China's market open policy in 1980s and so closed in 1994.

1916–1994

Apr.	1916	Discover outcrop of Sangdong mine by Mr Sunwon Hwang.
	1930	Application of “Sublevel Stopping” mining method.
Feb.	1934	Acquisition by Japanese Solim Mining Corporation.
Oct.	1946	Company name changed from Solim Tungsten Mining Company to Joseon Tungsten Mining Company.
Jan.	1947	Statement “Korean tungsten quality is the standard in global market” announced by USA national assay office.
Feb.	1947	Sangdong tungsten scheelite was exported to the US for the first time.
Apr.	1947	Statement “Sangdong Mine, producing monthly 100M/T of high quality tungsten concentrate with over 60% grade” announced by Minister Archer L. Lerch of USA military government.
Oct.	1949	Company name changed from Joseon Tungsten Mining Company to Korea Tungsten Mining Company.
Mar.	1952	Korea-USA Tungsten Trade Agreement.
Sep	1952	Official launching of Korea Tungsten Mining Co., Ltd.
Mar.	1954	Expiration of “Korea-USA Tungsten Agreement” and no extension due to a tungsten glut and price decline in the market.
Jun.	1956	Tunneling of the 1st Incline from Sangdong gallery
May.	1959	Completion of chemical processing plant construction
Jun.	1959	Mining footwall of Sangdong gallery / Ventilation tunneling of Taebaek gallery.
Dec.	1960	Completion of industrial water piping work from village (Chilyangee) stream.
Sep.	1961	Construction of Metal Bismuth smelting factory.
Feb.	1962	Completion of concentrate storage construction.
Sep.	1963	Install 100HP pump and pump room for flooding prevention on Level – 6.
Feb.	1965	Production of Metal Bismuth.
Aug.	1965	Tunneling of Baekun haulage gallery.
Dec.	1965	Tunneling of Taebaek gallery
Apr.	1966	Beginning of sand filling construction test (Apr.~Dec.)
May.	1966	Verification of Top Slicing mine method and adoption
Sep.	1967	Vertical shaft construction groundbreaking
Oct.	1968	Tunneling of Level 11
Dec.	1969	Beginning of re-mining from Level 1 and 10 / Tunneling of Level 12
May.	1970	Tunneling of Cross on Level 10
Aug.	1970	Construction of the 2nd processing plant (70ton/day)
Sep.	1970	Sangdong Mine flood damage by localized torrential downpour
Dec.	1970	Re-mining from Level 2 and 3 / Chute installation on Level 6,7,8,9,10
May.	1971	Chute installation from Sangdong gallery to Baekgun gallery
Dec.	1971	Tunneling of Sangdong inclined ventilation gallery
Oct.	1972	Replacement of wooden support by concrete support in gallery.
Dec.	1972	APT plant completion (3ton/day)
Apr.	1973	Closing of the 3rd Incline.
May.	1973	Beginning of the 1st tailing dam construction
Aug.	1975	Tunneling of Cross on Level 16
Feb.	1978	Tunneling of Cross on Level 15
Jul.	1979	The 1st tailing dam flood damage by localized torrential downpour
Nov.	1979	Re-mining from Jangsan gallery
Apr.	1980	Apply “Large hole burn cut method” as Sangdong blasting process.
Aug.	1982	Completion of the 2nd tailing storage
Feb.	1992	Company name changed from “Korea Tungsten Mining Corporation” to Korea Tungsten Corporation".
Feb.	1994	Sangdong Mine closed

Reginal geology map of Korean Peninsula

Project Geological map

2001–2015

Jun.	2001	Sangdong mining concession registered by Sewoo Mining Corp.
Jan.	2007	Sangdong mining concession transferred to Orient Hard Metals Holdings Korea Corp.
Mar.	2010	Company name “Orient Hard Metals Holdings Korea Corp.” changed to Sangdong Mining Corp.
Sep.	2015	Woulfe Mining Corp. (100% parent company of Sangdong Mining Corp.) acquired by Almonty Industries Inc.

Geology

In the perspective of regional geology, the Korean Peninsula is on the eastern margins of the North China-Korea platform underlaid by three blocks of Archean age; the Nangrim-Pyeongnam Block, the Gyeonggi and Yeongnam Massifs which are separated by the northeast–southwest direction Imjingang and the Okcheon belts of Phanerozoic age. The Sangdong mine is situated in the northeast part of the Okcheon Belt.

The lithology of Sangdong can be divided into three main zones such as the Pungcheon Formation of The Great Limestone, the Myobong Formation and the Jangsan Quartize from the upper and the lower in the cross-sectional diagram. The Sangdong Mine contains a skarn-type deposit with altered horizons of the Cambrian-age Myobong Formation. The metamorphosed strata include a biotite granite unit located at a depth of 700m which was intersected during exploratory drilling at 700m below. There is the Jangsan quartzite unit in the lower most area underneath the Myobong unit. The Great Limestone unit completes the series of altered horizons overlying the Myobong Formation. There are certain terms on the horizons such as the Hanging Wall, Main, and Footwall horizons based on its geological features from the uppermost to lowermost regions. The mineralised zone strikes east–west direction and dips to the north at between 15° and 30° with extensions of 1.3 km and 1.5 km.

External links

• Almonty Industries Official Website
• EDISON Investment Research Report – Almonty
• IntelRadio with Ellis Martin - Almonty Industries’ Lewis Black on being the leaders in tungsten