The Government of Liberia granted Youssef Diamond Mining Company (YDMC) an exploration license (MEL 11035) for diamond. After three years, YDMC applied for a two-year extension of the exploration license with a fifty percent reduction of the original license area of 996.32 km2 to 496.58 km2. In 2016, the Minister approved the application for the extension and YDMC was granted the new license (MEL 2121-16) on 29 March 2016.
During the period of the original license (MEL 11035), YDMC discovered the Camp Alpha dikes and pipe. From trenching and pitting operations, the company found out that the dikes are near vertical, measuring about ~10 m in width, and ~ 1 km in length. The pipe was carefully delineated and found to be ~500 m in length, 40-50 m in width with an area of about 22,500 m2 [2.25 hectares]. The walls are vertical and contacts with the country rock are sharp; the overburden thickness of the humus layer is ~ 1m; the alluvial horizon is 1-1.5 m thick; and the solid kimberlite, like most known pipes in the world, may go down to the depth of over 200 km. The walls are vertical and the country rock contacts are sharp (Table 1).
Table 1 Camp Alpha Kimberlite structure
| Humus layer | 1 meter |
| Eluvium | 1-1.5 meter |
| Kimberlite | >200 kilometers |
During the two-year extension, YDMC carried out the evaluation of grade and quality of the potential resource of the Camp Alpha kimberlite dike complex and pipe through bulk sampling of the deposit and also continued the exploration of the license area for other kimberlite dikes and pipes.
YDMC Exploration License (MEL 2121/16) is located in Gbarpolu County. The license area is 496.58 km2 with about five percent in Grand Cape Mount County. Access to the property om Monrovia is by the Monrovia-Tubmanburg paved road to Tubmanburg from where the property is reached by secondary roads north of Tubmanburg and northwest of Bopolu (county capital of Gbarpolu County).
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