Abstract:his paper comprehensively discusses the application and development of Centre Sample Recovery(CSR) method in the solid mineral exploration of China, with emphasis on the development and innovation by China through the process of CSR.Due to the limitation of the national conditions of China, it is impossible to copy the models of developed countries that use the more powerful drilling machines and stronger tools than that actually needed. So we have determined that our development orientation is to develop CSR drilling mainly for small diameter holes rather than unilaterally pursue the modernization of drilling machines. Based on the status of CSR used in foreign countries and the test results in China, it is confirmed in theory that the small diameter of CSR can also completely meet the geological requirements. The test data is provided as examples, which were collected from the bauxite drilling by spindle type core drill with 73mm dual-wall drill string to confirm the reasonability and reliability of the small diameter CSR method.Currently, it is difficult to process the moist samples in site when using CSR in the water beating stratum according to the foreign driller's experiences. To solve this problem, we set up a special team and put a lot of fund into the research. UP to now, we have made breakthroughs in processing the moist samples. We have developed a separator which can rapidly separate a various diameter range of moist samples in site. Although in the case that water influx volume in hole amounts to 30m3/h, the size of the samples which are larger than 200 meshes can be separated timely. Therefor the numbers of sample containers used in sampling can be cut down greatly, and the labour intensity of samplers can be reduced. Also the sample omitting, the sample confusing and the sample mixture can be avoided. Thereby the reliability and the representativeness can be ensured.In addition, both the 73mm and 89mm dual-wall drilling accessaries that we have developed can not only be suitably used with hydraulic top drive rigs, but also be suitably used with existing spindle type core drilling. Using those dual-wall drilling accessaries we have got higher drilling efficiency than the conventional core drilling, and continuous reverse circulation core drilling can also be achieved. The cores can provide such information as the stratum dip strike, specific gravity, and other natures which the conventional samples can not present. Undoubtedly it is a great development and innovation on CSR.
