The Mining Engineering Institute under the Academy of Coal Science has developed an advanced method of pit perpetuation that can be applied to anthracite mines.
The method helps to reinforce the rock bed around the pit by fastening rock bolts, injecting cement slurry and lining shotcrete support so that it can support the pit.
The researchers made a deep study of the world trend and literature concerning pit maintenance techniques and the situation of anthracite mines in the country in order to perpetuate pits with a small amount of steel materials. Through such deep inquiry they chose the innovative plans to confirm the construction materials, means and methods.
Accordingly, they completed the binding structure of rock bolts with spiral fixing points and confirmed the relevant mechanical building and distribution method. They also developed rock bolt adhesives and invented hole filler, feeding pumps and other construction devices.
This method was applied to a 100-metres-long section of the February 8 Jiktong Youth Coal Mine on a trial basis and its scientific efficacy was proved through months of observation.
Encouraged by this success, they introduced the method to many other coal mines with good results this year.
The method helps to significantly cut the cost for main drift maintenance as it requires no timber and much less rolled steel compared with steel support.
Given that the main drift can be maintained for more than five years without repair after the introduction of the method, it can greatly save labour, materials and fund.
Currently, many anthracite mines are introducing the method.
Jo Son Hyok
More From Naenara (En)
Modern houses have been built at the Munyang and Phyongam farms in Koksan County of North Hwanghae Province and the Ryongpho and
December 14, 2025
Modern houses have been built at the Munyang and Phyongam farms in Koksan County of North Hwanghae Province and the Ryongpho and
On November 20, the Hoeyang Army-People Power Station was inaugurated in Kangwon Province, which means the province carried out
December 14, 2025
On November 20, the Hoeyang Army-People Power Station was inaugurated in Kangwon Province, which means the province carried out
On December 6, 2016 the respected Comrade Kim Jong Un visited the December 6 Children’s Camp in Kangwon Province. Stepping into th
December 14, 2025
On December 6, 2016 the respected Comrade Kim Jong Un visited the December 6 Children’s Camp in Kangwon Province. Stepping into th
The Pukchang Thermal Power Complex has established a new process for turning fly ash into raw materials to be widely used in
December 13, 2025
The Pukchang Thermal Power Complex has established a new process for turning fly ash into raw materials to be widely used in
The Kangdong County Hospital was inaugurated in the suburbs of the capital city of Pyongyang in November. It is an outcome of the
December 13, 2025
The Kangdong County Hospital was inaugurated in the suburbs of the capital city of Pyongyang in November. It is an outcome of the
One of Korean children’s winter folk games, top spinning is played on ice or on the ground. In winter children play the game
December 13, 2025
One of Korean children’s winter folk games, top spinning is played on ice or on the ground. In winter children play the game
In the era of great change when the grand plan of the Workers’ Party of Korea for rural construction is being translated into
December 13, 2025
In the era of great change when the grand plan of the Workers’ Party of Korea for rural construction is being translated into
Ri Ho Son is an associate professor and PhD in electrical engineering at Pyongyang University of Transport. She became the first
December 12, 2025
Ri Ho Son is an associate professor and PhD in electrical engineering at Pyongyang University of Transport. She became the first
On December 12, 1948, the great leader Comrade Kim Il Sung visited the shooting range in the then Phyongchon plain in Pyongyang
December 12, 2025
On December 12, 1948, the great leader Comrade Kim Il Sung visited the shooting range in the then Phyongchon plain in Pyongyang
The agricultural workers of the Usan Cotton Farm in Hanggu District, Nampho Municipality and the Konha Farm in Manpho City, Jagang
December 12, 2025
The agricultural workers of the Usan Cotton Farm in Hanggu District, Nampho Municipality and the Konha Farm in Manpho City, Jagang
The provincial building materials exhibition-2025 opened with due ceremony at the Sci-Tech Complex on December 9. Presented to the
December 11, 2025
The provincial building materials exhibition-2025 opened with due ceremony at the Sci-Tech Complex on December 9. Presented to the
Proud entities visually showing the rapid development of the socialist countryside flourishing day by day are being built one
December 11, 2025
Proud entities visually showing the rapid development of the socialist countryside flourishing day by day are being built one
Associate Professor Choe Ryon, PhD, teaches at the Faculty of Korean Linguistics of Kim Il Sung University. She won the WIPO
December 11, 2025
Associate Professor Choe Ryon, PhD, teaches at the Faculty of Korean Linguistics of Kim Il Sung University. She won the WIPO
The secretary office of the premier of the Cabinet of the Democratic People’s Republic of Korea on December 10 informed the
December 11, 2025
The secretary office of the premier of the Cabinet of the Democratic People’s Republic of Korea on December 10 informed the
Choe Son Hui, minister of Foreign Affairs of the Democratic People’s Republic of Korea, No Kwang Chol, minister of National
December 11, 2025
Choe Son Hui, minister of Foreign Affairs of the Democratic People’s Republic of Korea, No Kwang Chol, minister of National
Pak Jong Chon and Jo Chun Ryong, secretaries of the Central Committee of the Workers’ Party of Korea, Kim Jae Ryong, department
December 11, 2025
Pak Jong Chon and Jo Chun Ryong, secretaries of the Central Committee of the Workers’ Party of Korea, Kim Jae Ryong, department
Mt Myohyang located in the northwestern part of the DPRK is one of the celebrated mountains. It is famous for its superb scenery.
December 10, 2025
Mt Myohyang located in the northwestern part of the DPRK is one of the celebrated mountains. It is famous for its superb scenery.
Agricultural workers moved with pleasure into modern houses newly built in farm villages of Jagang Province as part of the perfect
December 10, 2025
Agricultural workers moved with pleasure into modern houses newly built in farm villages of Jagang Province as part of the perfect
Rope-skipping is one of the Korean children's folk games that is played by skipping over a moving or fixed rope in different ways
December 10, 2025
Rope-skipping is one of the Korean children's folk games that is played by skipping over a moving or fixed rope in different ways
Choe Son Hui, minister of Foreign Affairs of the Democratic People’s Republic of Korea, sent a message of condolence to Sergei
December 10, 2025
Choe Son Hui, minister of Foreign Affairs of the Democratic People’s Republic of Korea, sent a message of condolence to Sergei
More Articles
