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)
The Pyongyang Electrical Appliances Joint Venture Company Ltd is working to help improve the management of the national power
October 27, 2025
The Pyongyang Electrical Appliances Joint Venture Company Ltd is working to help improve the management of the national power
The respected Comrade Kim Jong Un visited the Party Founding Museum on October 8, 2025 on the occasion of the 80th founding annive
October 27, 2025
The respected Comrade Kim Jong Un visited the Party Founding Museum on October 8, 2025 on the occasion of the 80th founding annive
Choe Son Hui, minister of Foreign Affairs of the Democratic People’s Republic of Korea, will visit the Russian Federation and
October 27, 2025
Choe Son Hui, minister of Foreign Affairs of the Democratic People’s Republic of Korea, will visit the Russian Federation and
Wang Yajun, Chinese ambassador to the DPRK, hosted a reception at his embassy on October 25 on the occasion of the 75th
October 27, 2025
Wang Yajun, Chinese ambassador to the DPRK, hosted a reception at his embassy on October 25 on the occasion of the 75th
There grows a zelkova tree beside the Jogye Gate of the Sogwang Temple, about 20km north of Kangwon Province’s Kosan county
October 27, 2025
There grows a zelkova tree beside the Jogye Gate of the Sogwang Temple, about 20km north of Kangwon Province’s Kosan county
Flower baskets were placed before the Friendship Tower on October 25 on the occasion of the 75th anniversary of the Chinese
October 27, 2025
Flower baskets were placed before the Friendship Tower on October 25 on the occasion of the 75th anniversary of the Chinese
A delegation of the Chinese People’s Liberation Army led by Xia Zhihe, political commissar of National Defence University of the C
October 27, 2025
A delegation of the Chinese People’s Liberation Army led by Xia Zhihe, political commissar of National Defence University of the C
Large-scale projects for public welfare are under way in the DPRK, producing tangible results. As one of the typical examples,
October 27, 2025
Large-scale projects for public welfare are under way in the DPRK, producing tangible results. As one of the typical examples,
New villages have been built again at the Songnae Farm in Kyongwon County, North Hamgyong Province. These fairyland villages are
October 27, 2025
New villages have been built again at the Songnae Farm in Kyongwon County, North Hamgyong Province. These fairyland villages are
The birth of the Workers’ Party of Korea on October 10, 1945 was a historic turning point in shaping the destiny of the DPRK and i
October 26, 2025
The birth of the Workers’ Party of Korea on October 10, 1945 was a historic turning point in shaping the destiny of the DPRK and i
The Jangsan Mine takes an important share in the country’s refractory industry. Recently it has increased its output by
October 26, 2025
The Jangsan Mine takes an important share in the country’s refractory industry. Recently it has increased its output by
Cities and counties across the country are directing primary efforts to increasing the area of forests of economic value by
October 26, 2025
Cities and counties across the country are directing primary efforts to increasing the area of forests of economic value by
A house moving ceremony was held in mid-September in Phungthan Farm, Sunchon City, South Phyongan Province, amid a new era of
October 26, 2025
A house moving ceremony was held in mid-September in Phungthan Farm, Sunchon City, South Phyongan Province, amid a new era of
The laughter of the people leading a happy life in the ever-prospering socialist ideal village has resounded through the Kumdae
October 26, 2025
The laughter of the people leading a happy life in the ever-prospering socialist ideal village has resounded through the Kumdae
There is a stone bridge named Sonjuk over the Rogye Stream in Sonjuk-dong, Kaesong. The bridge, 8.35m long and 3.36m wide, was
October 26, 2025
There is a stone bridge named Sonjuk over the Rogye Stream in Sonjuk-dong, Kaesong. The bridge, 8.35m long and 3.36m wide, was
More dwelling houses have been built at the Sudo Farm under the South Hamgyong Provincial Rural Economy Committee and the Ryongsin
October 25, 2025
More dwelling houses have been built at the Sudo Farm under the South Hamgyong Provincial Rural Economy Committee and the Ryongsin
On November 16, 2016 the respected Comrade Kim Jong Un paid a visit to the May 27 Fishery Station in the east coast of the DPRK.
October 24, 2025
On November 16, 2016 the respected Comrade Kim Jong Un paid a visit to the May 27 Fishery Station in the east coast of the DPRK.
The 18th Pyongyang International Film Festival opened at the Pyongyang International Cinema House on October 22. Present at the
October 24, 2025
The 18th Pyongyang International Film Festival opened at the Pyongyang International Cinema House on October 22. Present at the
A ceremony for remodelling the cemetery of fallen fighters of the Chinese People’s Volunteers (CPV) in Sinphyong County, North
October 24, 2025
A ceremony for remodelling the cemetery of fallen fighters of the Chinese People’s Volunteers (CPV) in Sinphyong County, North
New dwelling houses have been built at the Ponghae Vegetable Farm in Chongjin City, North Hamgyong Province, the DPRK, as
October 24, 2025
New dwelling houses have been built at the Ponghae Vegetable Farm in Chongjin City, North Hamgyong Province, the DPRK, as
More Articles
