The surface of the Republic is discretized into mining squares which are quadrilaterals whose vertices are 30 arc
seconds apart in latitude and longitude (approximately 86 ha) (cf https://thaurfin.com/carre-minier.pdf )
The surface area of the 3 polygons is 471 squares each, which is the maximum authorized by the mining code. The
area of each polygon is 405sqkm and the total area is 1215 sqkm
