Study on the open pit limit with various technical condition

The recovery rate of mining and processing, and waste in-ore rate are the important technical parameters in open pit mine design.It is significant to study the sensitivity of open pit mine with these parameters changing, which has important influences on the economic benefit and design scale of mine.Firstly, according to the case of mine, the basic model for optimizing ultimate pit limit is built, containing the surface elevation model, grade model and step model.Then, based on theory of the moving cone elimination, and combining the current market situation and technical condition, the ultimate pit limit is optimized.Finally, the characters of economic benefit and design scale of open pit mine are studied while the recovery rate of mining and processing, and waste in-ore rate change in a given range.The study shows that either economic benefit or design scale has a big difference on the sensitivity to these three parameters.