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2 The mine shall carry out the necessary rock mechanics work to evaluate the collapsibility of the ore; the design shall comprehensively determine the spacing of the ore points and other bottom structural parameters according to the properties of the rock, the height of the caving and the predicted blockage of the caving;
3 The bottom structure shall be made of high-strength concrete or other effective supporting means, and the transverse beam shall be provided at the eyebrow line;
4 The initial pull-down position and the bottoming direction should be comprehensively determined according to the structural distribution, rock properties, grade distribution and other factors of the entire mining area; the initial pull-down position should be placed in a good collapseable part;
5 When handling the card, it is strictly forbidden for personnel to enter the lower part of the arch; when the second piece is broken, it is strictly forbidden to use the bare pack blasting except for special circumstances;
6 The mine release plan should be prepared and the mine should be strictly controlled; the space between the caving face and the loose material surface under the caving should be 5m to 7m ; the corresponding safety measures should be taken during the rainy season.
What regulations should be met in the natural caving mining method?
 1 The natural caving mining method should be applied to the development or medium development of ore joint fissures, and the thick ore body with less inclusions and regular ore body shape;