 The vicinity of the mine to villages or towns was also a determinant factor when deciding about working on site , because of the high cost of material transportation (Martinon-Torres & Rehren in press, b).
<clarity>  The vicinity of the mine to villages or towns was also a determinant factor when deciding about working on site , because of the high cost of material transportation (Martinon-Torres & Rehren in press, b).
 The vicinity of the mine to villages or towns was also a determinant factor when deciding about working on site due to the high cost of material transportation (Martinon-Torres & Rehren in press, b).