adds an ex_act to ore boxes. Explosions no longer del all the ore in a box

code/modules/mining/satchel_ore_boxdm.dm

@@ -95,4 +95,22 @@
 		O.loc = src.loc
 	usr << "\blue You empty the ore box"
 
-	return
+	return
+
+/obj/structure/ore_box/ex_act(severity)
+	switch(severity)
+		if(1.0)
+			for(var/obj/item/weapon/ore/O in contents)
+				O.loc = src.loc
+				O.ex_act(severity++)
+			del(src)
+			return
+		if(2.0)
+			if(prob(50))
+				for(var/obj/item/weapon/ore/O in contents)
+					O.loc = src.loc
+					O.ex_act(severity++)
+				del(src)
+				return
+		if(3.0)
+			return