quick fix for coin values not working

code/modules/mining/coins.dm

@@ -11,6 +11,7 @@
 	slot_flags = SLOT_EARS
 	var/string_attached
 	var/sides = 2
+	var/mining_value = 1
 
 /obj/item/weapon/coin/New()
 	pixel_x = rand(0,16)-8
@@ -19,30 +20,37 @@
 /obj/item/weapon/coin/gold
 	name = "gold coin"
 	icon_state = "coin_gold"
+	mining_value = 2
 
 /obj/item/weapon/coin/silver
 	name = "silver coin"
 	icon_state = "coin_silver"
+	mining_value = 2
 
 /obj/item/weapon/coin/diamond
 	name = "diamond coin"
 	icon_state = "coin_diamond"
+	mining_value = 15
 
 /obj/item/weapon/coin/iron
 	name = "iron coin"
 	icon_state = "coin_iron"
+	mining_value = 1
 
 /obj/item/weapon/coin/phoron
 	name = "solid phoron coin"
 	icon_state = "coin_phoron"
+	mining_value = 2
 
 /obj/item/weapon/coin/uranium
 	name = "uranium coin"
 	icon_state = "coin_uranium"
+	mining_value = 2
 
 /obj/item/weapon/coin/platinum
 	name = "platinum coin"
 	icon_state = "coin_adamantine"
+	mining_value = 3
 
 /obj/item/weapon/coin/attackby(obj/item/weapon/W as obj, mob/user as mob)
 	if(istype(W,/obj/item/stack/cable_coil))