The limestone mine “Drenovača” is currently engaged in the production of commercial limestone of various fractions: 0-4; 4-8; 8-16; 16-31; 0-31; 31-65 and others, as well as broken stone and scree. The annual production capacity amounts to an average of 120.000 m3, of which 60% refers to stone fractions, and 40% to bulk material.
We see the application of these fractions in construction and infrastructure. In addition to the production of commercial limestone, we also produce stone dust, which is used for calcification of agricultural land.
The production process itself consists of several technological stages:
PHASE OF PREPARATION AND EXPOSURE OF LIMESTONE
This phase is the first and consists of removing surface mechanical impurities and preparing the ground for the smooth movement of machinery.
DRILLING AND BLASTING
The drilling and blasting phase is the initial phase in limestone excavation. Blasting with a very small percentage of negative effects gives us positive effects in the following phases of work, because good crushing of the rock mass is easier for loading, transport and crushing.
LOADING AND TRANSPORT
After drilling and blasting, loading and transport of blasted material is started. The material is loaded with hydraulic excavators (backhoes), at the blasting site, into trucks or dumpers with which the material is transported to the crusher or to the depot.
CRUSHING AND CLASSIFICATION
Crushing of raw stone is done on an impact-rotary crusher, where a buffer of 0-60 mm is obtained from the upper limit coarseness of 1,000 mm, which is deposited in the intermediate stone depot. Grading is done by separating the buffer 0-60 mm from the intermediate depot into fractions 0-22 mm using two vibro screens. In the grading process, the 0-60 mm buffer is screened into the desired fractions by a vibro-screen, by setting the screen surfaces of the corresponding openings.
SHIPPING
Shipping is done in such a way that the finished products are loaded into trucks using loaders. Cubing of the loaded mass in the truck is done using the bucket of the loading machine. The annual shipment amounts to an average of 90,000 m3.
It is also important to emphasize that we have material quality certificates, based on reports on laboratory testing of all stone aggregates produced at SP Drenovača, .
