What must mining companies do after locating diamond deposits?

After locating diamond deposits, mining companies must evaluate and develop them. This step is crucial as it involves assessing the potential of the deposit in terms of size, quality, and accessibility. Evaluation includes exploring the geological characteristics and conducting feasibility studies to determine if and how the deposit can be economically mined.

Development comes next and refers to the planning and preparation required to extract the diamonds safely and efficiently while adhering to environmental regulations and responsible mining practices. This process ensures that the mining operation can be carried out profitably and sustainably, balancing economic interests with social and environmental responsibilities.

Other options like immediately selling the deposits or appraising their value do not address the necessary steps involved in preparing a mine for operation. Distributing diamonds among retailers cannot happen until there is a structured plan for extraction and production, making evaluation and development a foundational requirement in the diamond mining process.