The Santo Domingo Project is strategically located near key infrastructure (highway, rail, power lines and sub-station, port and airport) at low elevation (1,000 metres) in an established mining district with several significant copper and iron mining and smelting operations. The project is 100 kilometres from the Pacific coast, providing access to deep water port facilities.

The Santo Domingo Project 2018 Technical Report (“2018TR”) considers the development of two open pit mines using conventional drilling, blasting, loading with diesel hydraulic shovels, and truck haulage, and a copper-iron concentrator designed to process a nominal 65,000 tonnes per day ("tpd") to 60,000 tpd (throughput is reduced in the latter years as the ore becomes harder) using Semi-Autogenous Grinding (SAG) and ball milling, with conventional flotation utilizing desalinated water to produce a copper concentrate. Magnetite iron will be recovered from the copper rougher tailings using Low Intensity Magnetic Separation. The planned infrastructure for the Project also includes a tailings storage facility, an iron concentrate pipeline and a third party desalinated water supply pipeline; a port-located magnetite iron concentrate filter plant and stockpile; a port-located copper concentrate storage building; a desalination plant; ship loading facilities; and on-site and off-site infrastructure and support facilities.

The TR2018 indicates that for the first five years of full operation, Santo Domingo will have an annual average copper production of approximately 259 million pounds (approximately 117,500 tonnes). The life of mine average production is 134 million pounds of copper (approximately 61,000 tonnes) per year over a period of approximately 18 years. The total life of mine copper production is estimated at 2.4 billion pounds (approximately 1.1 million tonnes). For iron ore concentrate, for the first five years of full operation, the annual average iron ore concentrate production is estimated to be 3.3 million dry metric tonnes (“dmt”). Over the life of mine, the iron ore concentrate production will increase to an annual average of 4.2 million dmt, with a total estimated production of approximately 75.1 million dmt.

In July 2015, Capstone received approval of the Environmental Impact Assessment (EIA) for the Santo Domingo project. To date, three of the five long lead permits required for construction have been received, with the remainder expected in 2019.