replaces explosive mines with (new) sentry mines

code/game/objects/effects/mines.dm

@@ -53,6 +53,15 @@
 	if(isliving(victim))
 		victim.Weaken(stun_time)
 
+/obj/effect/mine/depot
+	name = "sentry mine"
+
+/obj/effect/mine/depot/mineEffect(mob/living/victim)
+	var/area/syndicate_depot/core/depotarea = areaMaster
+	if(istype(depotarea))
+		if(depotarea.mine_triggered(victim))
+			explosion(loc, 1, 0, 0, 1) // devastate the tile you are on, but leave everything else untouched
+
 /obj/effect/mine/dnascramble
 	name = "Radiation Mine"
 	var/radiation_amount

code/game/objects/effects/spawners/random_spawners.dm

@@ -170,7 +170,7 @@
 /obj/effect/spawner/random_spawners/syndicate/trap/mine
 	name = "50pc trap landmine"
 	result = list(/datum/nothing = 1,
-		/obj/effect/mine/explosive = 1)
+		/obj/effect/mine/depot = 1)
 
 /obj/effect/spawner/random_spawners/syndicate/trap/documents
 	name = "66pc trapped documents"