3 man mine value assigned

src/engine/objects/Mine.java

@@ -677,6 +677,9 @@ public class Mine extends AbstractGameObject {
         int value = Warehouse.getCostForResource(this.production.UUID);
         int amount = 0;
         switch(this.capSize){
+            case 3:
+                amount = 1800000;
+                break;
             case 5:
                 amount = 3000000;
                 break;