better lend holding

I think GRY has better land holding than AMX's. why?

Please have a look the map, the big gold discovery in West Africa (3m oz +) are all in 2 black rectangular area,the red rectangular area is biger, but no big discovery, the difference between 2 area is the Sedimentary(Birrimian)and
Volcanics(Birrimian, Greenstone)in Black Rectangular is narrow.

GRY lend holding(blue cycle) is in Black Rectangular, and AMX's(green cycle) in in RED Rectangular.

On page 6 of AMX JULY Presentation showing Ghana and Mali have 29% West Africe Greenstone Belt(in black rectangular), discovered 143 moz gold so far, but Burkina Faso and Cote D'Ivoire have 57% West Africa Greenstone Belt( mainly in Red Rectangular) only found 20 moz gold.