OREANDA-NEWS. June 01, 2009.  OJSC “KMAruda” The new stall (1/25 S-E-UV) has been put into operation at Gubkin mine. Its mineable reserves – 340 thousand mt of ferruginous quartzite. Magnetic iron content-25,8%, iron content-31,4% The stall’s length is 55 m, width-30m, height-55,5m Quartzite from the new stall will be conveyed to bore 3 and segment 2 of the crushing-and-cleaning plant .