There are many types of contracts in the mining sector. This article deals with the agreements related to the acquisition of mining properties. These are ordinary commercial documents that deal with a particular asset, a mining property. We will describe the main agreements related to the acquisition of mining properties. The most common contracts are the purchase option, "joint venture", "opt-in" or "farm-in". These contracts are usually applied based on legislation from Canada, the United States or Australia, countries with a historical development of mining law. Therefore, this article describes these agreements in which one party may acquire from another a mining property, either in whole or in part, for the purpose of exploring that property and, if successful, proceeding to the development of a mine.