The Jalainure Open-pit Mine has been mined for a 100 years, resulting in a mining pit area of about 5 square km and an extended area of 10 square km. With a maximal height difference up to 100 meters, the waste disposal site in its proximity is 1276.12hm2.
Part of the original coal seam has been burning for more than a century. This has wasted quality energy massively, given off poisonous gases, and made the land useless, where plants could not grow.
As surface and underground water was not under protection and management at the early stage of mining, massive water surfaces and water-permeated layers have been formed with a depth of up to more than ten meters. This easily resulted in pit settlement, erosion, and hanging ditches, likely to cause the pit walls to break and collapse in the end.
Meanwhile, the mine was littered with wastes, which could, when the precipitation was concentrated, easily cause geopolitical slides or creeps. As the natural vegetation restoration rate was less than 20%, the local ecology called for urgent restoration.
With years of experience in mine/barren mountain restoration, M•Grass teams are committed to solving ecological problems ecologically.
M•Grass carried out land remediation at open-pit coalmines by managing the slope surface in line with the original terrain through stepped descent and layered restoration. It managed and restored the damaged land through engineering and biological measures such as topsoil stripping, refill, land leveling, and topsoil restoration according to the local soil conditions. It implemented soil improvement through organic fertilizer proportioning, broadcast sowing and rotary tillage. It achieves soil restoration at mines and prevented water and soil losses to protect the ecology at the mines.
In the process of management, M•Grass developed new and dedicated technology products for protective slope greening, such as M•Grass vegetation carpets and bio-fence, which could prevent water and soil losses, consolidate and protect slopes, and improve plant productivity. More importantly, they enabled plants to degrade and decompose and provided natural nourishments for grass. After vegetation restoration was completed, water from the mine pit was used to irrigate the vegetation as a way of disposing of and reusing mine pit water and preventing water from stagnation that might lead to settlement.
With years of research and practice, M•Grass teams have compiled the Technical Standards for Revegetation at Open-pit Coalmine Dumps in North China Grassland and are formulating the corresponding local standards, providing a basis for mine revegetation in North China in the future. M•Grass will establish a mine revegetation research institute in the Jalainur region, seeking to study and demonstrate the results of mine revegetation in China, from which it will build a special team for mine revegetation.