The following criteria are mandatory and no open space assessment shall be granted unless all such criteria are complied with:
A. The land in question must have a greater value for other use.
B. The land proposed for open space assessment must lie within one of the following Mineral County land use districts as set forth and defined in the Mineral County master plan:
1. Agricultural;
2. Grazing;
3. Recreational;
4. U.S. forest/recreational;
5. Watershed and open range.
C. The proposed open space use assessment would be in conformance with the Mineral County master plan and in furtherance of the public health, safety and general welfare. (MC Ord. 53A §3(1), 1975)