I found the perfect plugin for this server it helps againt Xray Mods an Texture Packs
http://forums.bukkit.org/threads/sec-antixray-v0-2-5-protecting-ore-from-xray-mod-and-transparent-texturepacks-670.12527/
http://forums.bukkit.org/threads/sec-antixray-v0-2-5-protecting-ore-from-xray-mod-and-transparent-texturepacks-670.12527/