«Belgorkhimprom» JSC (Minsk, Republic of Belarus):

Pleskunov V. N., Deputy Chief Engineer, Candidate of Engineering Sciences, e-mail: pleskunov1953@mail.ru

Shvab R. G., Head of Scientific-Research mine department, e-mail: nigo@inbox.ru

«IEEC» LLC (Moscow, Russia):

Pleskunov I. V., Head of Mining Projects, e-mail: pleskunov@imcgroup.ru

Feasibility studies, calculation and assessment of complex of basic mining-geological factors were carried out by example of He-Chan layer deposit (Vietnam). These factors define the possibility and conditions of joint open-cast-underground development of coal series. Hazardous influence of open pit on underground mine has the following main factors:seismic influence of single blasts (to 40 t of explosives) on excavations; turning of open pit into large water reservoir in the period of monsoonal rainfalls, threatening with mine flooding. It is necessary to carry out the researches and calculations (analogue to the ones, given in the article) to each characteristic site of deposit for the purpose of designing and practical observance of hard calendar plan (schedule) of development of open-cast and underground mining.

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