puchase of soil - Goods and Services Tax - GST

Dear Sir/Madam, I wanted to start a business of supplying soil to the builders and for that I started studying the market for purchase of soil at first. from the vendor to whom the government has allotted the land for mining is not issuing a proper bill for the sale of soil and instead just issuing a challan for dispatch. So, it is not possible for me to take the material as there is no bill. so what can be done if any one can help in this case. Someone suggested to pay it under RCM and issuer bill to party but as far as I checked for soil it is not covered under RCM but there are people in industry doing the same. Please suggest how to proceed. Thanks In Advance ANKUR AGARWAL