junaidkhank06, to analyze your reply point by point:
... here gold are burruied but deeper here a man was found mud pot full of gold and silver coin other man was found small horse made of gold
Uh, "mud pot" and "horse statue" make me think your original post was referring to large objects. And not singular coin hunting, right ? Ok then, ditch BOTH those machines you list, and simply get yourself a 2-box detector like the Whites TM 808. You will not be bothered with any items smaller than a soda-can sized. Hence the perfect discriminator to pesky single coins, nails, pulltabs, etc.... They simply don't see any objects that small. Yet does great for box sized objects at depth.
.... i am asking what metal detector detet gold coin much deeper minelab GPZ 7000 or garrett ace ATX my friend have garret ace 150 ...
You do NOT want to use the GPZ 7000 for relic/cache hunting. It's a nugget machine. You will be driven bonkers by every last staple, pinhead, nail, straight-pin, etc.... And to the extent that , yes, it will get box sized objects super deep, yet you will spend forever and a day trying to discern big versus little, and chasing a million things you don't want. A 2-box unit will also get boxes very deep, and you don't get bothered with non-cache sized items.
.... we do meteldetecting with that detector but its not good at gold.
All those detectors will do "good at gold", depending on what you mean. Ie.: nuggets (no, the 150 is not for nuggets), or teensy jewelry , or individual coins, or caches, etc... The 150 is a starter beginner machine. So when you say "not good at gold", well it's going to be bottom of it's class on every other avenue (silver, copper, TID, mineral-ability, etc...) too. But when it comes one-target versus another, no, it's no worse on gold, than it is on silver GIVEN ITS INTENDED MARKET AND PRICE RANGE. I bet the 150 will do *just fine* if a box of gold is a foot or two deep, and you were using it right
Get a TM 808 if you're looking for caches. And unless you're looking for nuggets, skip the GPZ.