Try here.
Red line box (or solid filled circles) for very deep coins/treasure or artifacts of value.
Green in general is a color indicator, I use for various other targets mostly archaeological (old ruins or foundations but especially those non-metallic objects such as Indian flints, glass, pottery, carved stone with treasure signs).
White in general is a color indicator, I use for natural caves or man made tunnel entrances and mine shafts, other similar type excavations (including tombs).