Sell a quartz mine in Brazil

My Brazilian partners need someone with marketing research capabilities to sell a Quartz mine located in Bahia, Brazil. The work is paid by a commission after the sale is done. The quartz mine value is 20 million dollars. If you can sell this mine you will get a commission of 0.5% over the final price. This is not a paid by the hour job. My partners have already the government authorization for mining operations. Another business possibility is doing an international partnership for exploration