Mine waste rock and overburden dumps are massive structures and are usually the most visible landforms left after mining. The spreader could be generally described as the last member in the chain of the continuous waste haulage process of mining equipment, operated and designed for mines with different application scenarios. Basically overburden or waste rock generated during the extraction, beneficiation, and processing of minerals will be discharged onto a dump at a designated area in an economical and efficient manner through the discharge boom of the spreader. The main and primary function of the spreader is to perform as a continuous spreading waste handling machine. The term direct dumping systems could be explained as the dumping method with the shortest waste haulage way possible, which is also automatically related with the lowest total haulage costs. One of the main criteria of the site selection is that it doesn’t interfere with production and auxiliary operations at any time of mine stage and mine life. Over the last decades Sandvik´s spreader reference project list has been growing continuously whereas the C-frame type (PA200) with a 50 meter receiving and 50 discharge boom length at various capacity ranges from 5500mtph (metric tons per hour) up to 21000mtph had fit the most to waste dumps around the globe. In total, out of 32 Sandvik spreader projects, 16 of them have the above mentioned spreader dimensions. The determination of the discharge boom length has the biggest influence on the weight of the spreader and furthermore also on that of the main assembly. Thus, it is an important parameter also for equipment cost. Depending on the required slope angle, in case the toe of the waste dump must be reached, the length of the boom increases proportionally to the increase of the depth of the low dump. In so called “hard rock” mines especially under dry conditions and material with less moisture content, it is not always required to have a discharge boom length reaching the toe of the dump as long as the spreader satisfies, from a geotechnical assessment, a safe distance to the crest. This project demonstrates the importance of collecting detailed geo-mechanical information as well as the investigations of various test samples and other relevant parameters which are essential for the design and furthermore also affecting the stability of waste dumps.
|Translated title of the contribution
|Waste Dump Spreader Configuration
|23 Oct 2014
|Published - 2014