Accidents at an underground coal mine in Sawahlunto City between 2009 and 2017 have occurred several times and resulted in fatalities. Most of the accidents occur due to methane gas explosions. And clearly this is an indication of the poor management of the air ventilation system in the underground coal mine. The air ventilation system in underground mines is actually very important and is like the flow of blood to the human body. Underground coal mines can continue to produce if the air ventilation management system is carried out properly and according to existing regulations. The management of the air ventilation system in underground coal mines consists of how to control the quality and quantity of air in the mine so that it meets the required threshold values. Management of a good ventilation system will generate confidence for workers to remain active in comfort with high work efficiency. This article will reveal the importance of evaluating and analyzing the need for air ventilation systems in underground coal mines, with case study in several mines operating in Sawahlunto

Underground mine activities is not detached by mechanical ventilation system for supplying air demand for worker's breathing, dirty air and toxic gases removing, dust reducing, and heat and humidity controlling. There for makes safer and enjoyable in working. To facility the study of mine ventilation in campus, the simulation study about mechanical underground mine ventilation system was applied. To do this research, the describtion about mechanical ventilation system of underground mine is necersary and also we need pay attention with the parameters in air qualities and quantities controlling witch are not over limit to the limit value (NAB). Describing how to control the air qualities and quantities, the writer got sample as well as PT. AICJ. PT.AICJ's ventilation system is forcing system with some parameter like air velocity, wet and dry temperature, relative humidity, tunnel dimension, and around of gases concentration in air at mine front. Gases measured to wards the concentration of O2, CO2, CH4, and H2S. In this research, the writer designed and created a simulation of ventilation system, with autoCAD 2014 modeling advises. In the other hand the material that, used for equipment is iron plate 1 mm thickness. Volumetric air flow rate produced by forcing fan (18" diameter size) is 0.23m 3 /second with 26 0 C effectively temperature. Medium air flow rate is 0.24m/second with is 25,3 0 C effectively temperature. High air flow rate is 0,26m/second with 24,7 0 C effectively temperature, while volumetric air flow rate of forcing fan 16" diameter size is o,26 m 3 /second with 24,4 0 C effectively temperature, for exhaust fan (4"size) produced 0,18 m 3 /second volumetric air flow rate with 26,5 0 C effectively temperature . so the simulation equipment ventilation can show measure result by quantity and quality airflow characteristic.

The excavation of a underground rock mass resulting a change in the balance of rock conditions such as the occurrence of rock collapse and changes in the dimensions of tunnel as a result of the displacement of the voltage distribution. It is desirable to have a good geotechnical analysis to provide an appropriate treatment of rocks excavated. This research was conducted to determine rock mass class, rock strength. Classification of rocks mass with RMR system And Q-System FK potential of wedge using unwedge software. From the measurement of several parameters of RMR method, RMR value of 48 ( Coal) and 60 (Sillstone) is obtained where as rock mass class III (fair rock), based on the Q-System obtained a value of 14 in class II for coal and 4 Class III for Sillstone. Based on the RMR-system classification, the value for span maximum is 3 m with a collapse time of 110 hours and the value of the load collapses is 1,56 tons / m2. Based on the Undwedge Software processing, there was an increase in FK values for both methods, Based on Support RMR Ground from 1,907 to 2,939 and Based on Ground Support Q-System from 1,907 to 2,078.

This research is a literature study that examines the relevance of the mining vocational education curriculum in the preparation of MBKM. The problem that occurs today is that the curriculum is not relevant and not in accordance with the needs of industry and the field of work, and for that need to do curriculum relevance, and preparation in facing MKBM. This research method uses a literature review study. The findings prove that it is necessary to carry out the relevance of the mining vocational education curriculum starting from the MBKM policy design, MBKM preparation, and MBKM implementation, besides that it also needs to be relevant to the curriculum for analyze the competence of the mining job field required by the company and disclose a map of mining job positions relevant to preparation for the MBKM curriculum.