Developing hidden disaster factors in non-coal underground mines

1. Census objects

Non-coal underground mines with normal production and construction, rectification or rectification of production stoppage, resource integration, merger and reorganization.

2. Work content

(1) Survey and control of disaster factors caused by goaf and surrounding old kilns.

1. Goaf. For the remaining gob mined by open-pit method, the hanging roof gob mined by caving method, the gob formed in history, and other gob that has not been filled and controlled, the distribution of the gob (including location, shape, area, height, span, volume), formation time, water accumulation, etc. shall be ascertained by means of investigation and visit, geophysical exploration, geochemical exploration, drilling and three-dimensional scanning. The relevant information of the goaf is plotted on the relevant drawings, and the relevant data ledger of the mine is established. Take effective measures to control.

2. Surrounding abandoned mine (shaft). Find out the closure time, mining scope, distribution of shafts and lanes, water accumulation status of abandoned mine (shaft), and whether there is communication with the mine or the movement range of rock mass overlaps with each other, and plot relevant information on relevant drawings to establish the account of abandoned mine shafts and lanes; Take effective measures to control.

3. Goaf management projects that have been implemented. Find out the method, location and project situation of the goaf treatment project, analyze the effect of the treatment project, and plot the relevant information on the relevant drawings; Where governance is not in place, governance will be re-implemented.

(2) Survey and control of hydrogeological disaster factors.

1. The ground contains water. Identify hydrogeological conditions such as water-containing (isolated) layer, structural fracture zone, water-rich and water-conductance of roof and floor that affect the safe mining of mines, as well as the source, water quantity, water level, water quality and water-conductance channels of various water-containing bodies, predict the normal and maximum water inflow of mines, and classify the complexity of hydrogeological conditions. Improve the mine hydrogeological map, main middle hydrogeological plan and hydrogeological profile; Take effective measures to control.

2. Underground karst. The spatial distribution and development degree of karst in the mining area, solubility of soluble rock, reconstruction degree of soluble rock by structure, scale and filling of karst caves (including underground rivers), and surface karst collapse are ascertained, and relevant information of karst is plotted on relevant drawings. Take effective measures to control.

3. Surface water bodies. To ascertain the catchment, drainage and leakage of surface water systems such as rivers, lakes and reservoirs in the mining area and surrounding areas that have an impact on mine mining and relevant water conservancy projects, the drainage and prevention facilities of surface DAMS, ditches and drainage ditches, the local annual precipitation, the highest flood level, peak discharge and inundation extent, etc.; Take effective measures to control.

4. Close poor holes. Identify the location and sealing conditions of geological exploration boreholes and engineering construction boreholes within the mining scope, analyze the sealing quality of each borehole, and plot relevant information on relevant drawings; Take effective measures to control.

5. Implemented mine water control projects. Identify the methods, locations and conditions of surface and underground water control projects that have been implemented, analyze the effects of each water control project, and plot the relevant information on the relevant drawings; Where governance is not in place, governance will be re-implemented.

(3) Survey and control of disaster factors caused by ground pressure.

1. Main geological structure. Identify the structural position and main structural direction of the mining area, as well as the distribution, occurrence, shape, opening degree, roughness, filling and cementation characteristics, scale and water filling of all levels of the structural plane, determine the grade of the structural plane and the main adverse advantages of the structural plane, evaluate the rock mass structure and quality of the orebody and surrounding rock, carry out engineering geological zoning, and analyze its influence on the mining of the deposit. Take effective measures to control.

2. Ground pressure activity area. To identify the surface pressure in mines such as roof subsidence and caving, roadway slope, rock burst impact, pillar deformation and loss, fill compaction and roof fall, rock stratum movement and surface collapse caused by mining, analyze the characteristics of ground pressure in mining and the local high ground stress concentration area, and divide and delineate the rock strata strata and lot locations that are prone to rock burst. Take effective measures to control.

3. Mine ground pressure prevention work. To find out the working methods and effects of ground pressure control, such as stope roof management, roadway and stope support, monitoring and early warning, etc.; Where governance is not in place, governance will be re-implemented.

(4) Survey and control of fire disaster factors.

1. Spontaneous combustion tendency. Find out the tendency of spontaneous combustion of ore, whether there is a history of spontaneous ignition, the scope of fire area, sealing, gas composition, etc. Take effective measures to control.

2. External cause of fire. To ascertain the distribution and use of equipment and facilities such as wood support, oil cables and other fuels and diesel transport vehicles; Take effective measures to control.

(5) Other contents that non-coal underground mining enterprises consider necessary to focus on general survey and control in light of actual conditions.

Iii. Working mode and time arrangement

The survey and control of hidden disaster factors in non-coal underground mines began in April 2022 and ended in December 2022.

(1) Centralized census management (April to September 2022). Each non-coal underground mining enterprise is responsible for the specific organization and implementation of the survey and control of hidden disaster factors of its own enterprise, and should carry out a comprehensive survey according to the contents of the survey of hidden disaster factors. Adhere to the general survey while governance, for major disasters found in the general survey, formulate management plans, implement responsibilities, measures, funds, time limits, and plans, and timely governance in place. After the completion of the general survey and management, it is necessary to form a general survey and management report (format see annex), report to the local county-level emergency management department before the end of October 2022, and input the information in the attached schedule of the general survey and management report "non-coal underground mine hidden disaster factors Census registration Form" into the basic information system APP for non-coal underground mines.

(2) Key supervision and inspection (October to November 2022). Local emergency management departments at all levels and provincial bureaux of the State Administration of Mine Safety supervision shall, in combination with safety supervision and supervision work, conduct comprehensive supervision and inspection of the survey and treatment of hidden disaster factors in non-coal underground mines according to the scope of responsibilities. Those who are not serious, perfunctory, or merely formal in carrying out census and control work should be overthrown and seriously dealt with to ensure that the census and control of hidden disaster factors are in place.

(3) Summary evaluation (December 2022). The local emergency management departments at all levels and the provincial bureaus of the State Administration of Mine Safety shall comprehensively summarize the survey and management of hidden disaster factors in non-coal underground mines, evaluate the effectiveness of the work and form a work report, and deepen the application of the results. According to the actual situation, the replicable experience and practice shall be extended to the fields of tailings ponds and non-coal open-pit mines in a timely manner to consolidate and deepen the work effect.

4. Job requirements

(A) Improve ideological understanding. The survey and treatment of hidden disaster factors in non-coal underground mines is an important measure to strengthen the safety production of non-coal underground mines. It is also a fundamental way to prevent various disasters and accidents effectively. Local emergency management departments at all levels shall, in light of the actual situation of non-coal underground mines in the region, study and formulate specific work plans, clarify the responsible person, work objectives, work tasks and schedule, and earnestly carry out the survey and control work in a solid, deep and detailed manner. The main person in charge of the non-coal underground mining enterprise (including the legal representative and the actual controller) is the first person responsible for the survey and control of hidden disaster factors, and must personally organize the formulation and implementation of work measures, ensure the necessary funds, materials and personnel, and ensure the effectiveness.

2. Strengthen guidance services. Local emergency management departments at all levels should strengthen the technical guidance and services for the survey and treatment of hidden disaster factors in non-coal underground mines, help non-coal underground mining enterprises to solve the key and difficult problems existing in the work in a timely manner, coordinate and organize regional survey and treatment services to ensure the smooth implementation of the survey and treatment work and the survey and treatment of hidden disaster factors in place.

3. Strengthen supervision and inspection. Local emergency management departments at all levels should take the survey and management of hidden disaster factors as an important content of on-site law enforcement inspection, and seriously investigate and punish non-coal underground mining enterprises that do not seriously carry out the survey of hidden disaster factors, go through the formalities, and do not implement measures to control hidden disaster factors. Establish an account of the hidden disaster factors that seriously affect production safety and urge enterprises to complete the treatment within a time limit. Where the safety of operation personnel cannot be guaranteed, it shall be ordered to stop production for rectification according to law and regulations. The provincial bureaus of the National Bureau of Mine Safety Supervision shall take the survey and management of hidden disaster factors as the focus of supervision, urge the relevant departments of local governments and mining enterprises to seriously organize and carry out, and report major problems to the National Bureau of Mine Safety Supervision in a timely manner.

(4) Timely submission of summary. The provincial emergency management departments, together with the provincial Bureau of the State Administration of Mine Safety, are requested to carefully sort out the work of the general survey and control of hidden disaster factors in non-coal underground mines after the completion of the work, summarize the work effectiveness, analyze the existing problems, put forward work suggestions, and form a work report to the State Administration of Mine Safety before the end of December 2022. The State Administration of Mine Safety will conduct spot checks on the general survey and treatment of hidden disaster factors in non-coal underground mines in various regions in due course.