Theory basis is provided for artificial blending rock, an approach is provided for exploiture Sichuan phosphate rock.

The stopping uses artificial pillar instead of natural pillar and mining practice in last over ten years demonstrates the methods used are quite efficien

[ Method] The coal miners received questionnaire investigation and their blood pressure、height and weight were measured, levels of plasma Ang Ⅱ were determined by radioimmunoassay in coal miners with hypertension and non-hypertension.

Objective We aimed to investigate the characteristic of pneumoconiosis on coal miners and provide scientific evidences for its prevention.

Conclusion Coal miners working underground are at a greater risk to contract hypertension than those working on the ground,and the contraction of the disease is not only related with the length of the miners\' working underground,but also related with smoking,wine drinking,obesity and the history of hypertension in their families.

The Changes Of Normotensive Offspringss of Spontaneous Hypertensives in Coal Miners

This paper utilizes data which was compiled from an investigation concerning science literacy and related factors among coal miners in Shanxi,Hebei,Heilongjiang,Sichuan and Shandong provinces,based on the analysis and research of the basic situation concerning science literacy related factors.

At present it has become an urgent task to assess the artificial mineral deposit by means of geology technique and to utilize such great potential resources.