Abandoned lead-zinc mine, in closed area near the border with China.
Ref.: Williams, T. (1991) The story of the Lin Ma Hang Lead Mine, 1915-1962. Geological Society of Hong Kong Newsletter, 9, #4, 3-27.
Mineralogy Society of Hong Kong:
http://minsochk.org/events/lmh.htm9 entries listed. 8 valid minerals.