OREANDA-NEWS. February 27, 2008. The Gubkin Mine saw this year's first mining chamber commissioned – 5/13 Sretenskaya. Its workable reserves are 352 thousand tons of ore, where high Fe Total is 35.6% and Magnetite Fe – 32.3%. The chamber’s dimensions are: 55 m in length, 57 m in height and 30 m in width. The established plan for the year 2008, which provides for 4 mil 331 thousand tons of iron formation, forces the miners to have no less than 3 mil tons of blocked-out reserves to successfully complete the work. This means that 13 to 14 chambers need to be commissioned during the year.