Split mining.dmi (#69442)

* split mining.dm

* Remove a pair of unused icons

* From merge conflict

Co-authored-by: tattle <article.disaster@gmail.com>

code/game/objects/items/stacks/sheets/leather.dm

@@ -240,7 +240,7 @@ GLOBAL_LIST_INIT(sinew_recipes, list ( \
 /obj/item/stack/sheet/animalhide/goliath_hide
 	name = "goliath hide plates"
 	desc = "Pieces of a goliath's rocky hide, these might be able to make your suit a bit more durable to attack from the local fauna."
-	icon = 'icons/obj/mining.dmi'
+	icon = 'icons/obj/stack_objects.dmi'
 	icon_state = "goliath_hide"
 	singular_name = "hide plate"
 	max_amount = 6
@@ -260,7 +260,7 @@ GLOBAL_LIST_INIT(sinew_recipes, list ( \
 /obj/item/stack/sheet/animalhide/ashdrake
 	name = "ash drake hide"
 	desc = "The strong, scaled hide of an ash drake."
-	icon = 'icons/obj/mining.dmi'
+	icon = 'icons/obj/stack_objects.dmi'
 	icon_state = "dragon_hide"
 	singular_name = "drake plate"
 	max_amount = 10

code/game/objects/items/stacks/sheets/mineral.dm

@@ -437,7 +437,7 @@ GLOBAL_LIST_INIT(abductor_recipes, list ( \
 /obj/item/stack/sheet/mineral/coal
 	name = "coal"
 	desc = "Someone's gotten on the naughty list."
-	icon = 'icons/obj/mining.dmi'
+	icon = 'icons/obj/ore.dmi'
 	icon_state = "slag"
 	singular_name = "coal lump"
 	merge_type = /obj/item/stack/sheet/mineral/coal

code/game/objects/items/stacks/sheets/sheet_types.dm

@@ -692,7 +692,7 @@ GLOBAL_LIST_INIT(bronze_recipes, list ( \
  */
 /obj/item/stack/sheet/bone
 	name = "bones"
-	icon = 'icons/obj/mining.dmi'
+	icon = 'icons/obj/stack_objects.dmi'
 	icon_state = "bone"
 	inhand_icon_state = "sheet-bone"
 	mats_per_unit = list(/datum/material/bone = MINERAL_MATERIAL_AMOUNT)