The purpose of this independent study was application of Lean Theory in increasing productive of calcium carbonate manufacturing process. The product chosen for this study was the production of calcium carbonate products, size 6 Mesh. These techniques lead organization to improve their productivity by remove non-value added processes. These are the main objective of this research. The techniques that will be implemented are Lean Manufacturing. Lean Manufacturing technique disposed all non-value added processes from receiving raw materials to finished goods, to use resources efficiently, reduce costs and reduce unnecessary time, together with Value Stream Mapping and then using technique of why-why analysis to analyze root cause and problem solving methods using ECRS. As a result, production volumes 6 Mesh size products increased from 10 tons/day to 15 tons/day, reduce 7 workers, reduce 1 loader, dump trucks carrying raw materials have increased by 1 vehicle, total lead time of a value stream mapping fell from 6,420 minutes to 4,910 minutes.