The vast majority of oil wells that are being drilled in the Williston Basin employ hydraulic fracturing as a completion technique. These wells use, on average, three to five million pounds of proppant, be it natural sand or ceramic beads, to keep these fractures open. Because of the tremendous amount of product utilized in North Dakota, the North Dakota Geological Survey undertook: 1) a study to find sand deposits in North Dakota that would meet the criteria and could be used as natural proppant and 2) a study to find local clay resources that could be utilized in the manufacture of ceramic proppant. The results of the sand study were reported by Anderson (2011). In the clay study, we focused on kaolinite deposits because high-aluminum kaolinite is one of the main ingredients in ceramic proppant.