Research On Low-Dilution And Loss Sublevel Caving Of Inclined Medium-thick Orebody In Xiadian Gold Mine

The vein gold deposits distribute widely in our country. With the increase of mining depth and augmentation of gold requiring quantity by civil economy, it's more and more needed to exploit secure high-efficient mining methods. Although a lot of research on the high-efficient exploitation field of vein gold deposits is carried out in the theoretical research of mining method and production practice of mines, the sublevel caving without sill pillar has been neglected at all times. Therefore, the secure high efficient mining method doesn't gain practical application. Researching into its reasons, the primary one is that technics and technique to exploit vein deposits by sublevel caving without sill pillar haven't been solved in reason, and the traditional caving sublevel has bigger ore loss and dilution. Thereby, it turns vein gold mine into a forbidden zone to use sublevel caving without sill pillar.On the basis of investigating the granule moving rules and low-dilution and loss exploiting mode of sublevel caving without sill pillar, aiming at the inclined and medium-to-thick orebody condition in Xiadian gold mine, the stope structure and ore blasting and drawing mode were more ameliorated in this thesis. First, the stope structure with natural falling roof, setting recovery drifts and keeping three-sublevel exploiting were investigated and applied so as to adapt the characteristics that ecumenical orebody in vein deposits had less lead-vertical thickness. Then, the deforming, moving and destroying rules of rock mass were studied, and the mechanism to induce mined areas roof fall by using the numerical simulation method Third, the ore break down clean technique on condition of changeful orebody borderline was resolved by using two kinds of blasting method medium-to-deep and shallow hole. Finally, using two ore drawing modes that ore was drawn by cut-off grade in recovery drifts, and ore in other drifts was controlled to discharge by drawn quantity, ore dilution and loss ratio were controlled Thereout, a new scheme of sublevel caving without sill pillar was formed, which adapted to the vein gold deposits exploiting conditions. The new scheme has already used in practice in Xiadian gold mine.The No â…¦ orebody in Xiadian gold mine is a typical vein gold deposit. Its ore-rock has developed joints and fissures, and the orebody is deep embedding and inclined, medium-thick.