As
@tmj883 pointed out there are deposits of Carlin type gold in Iran and you can find an excellent description
HERE. There are some interesting and concerning points in the article, first and foremost the gold is contained in arsenic rich pyrite. In case the OP was not aware arsenic when put into acids, (hydrochloric, nitric, and sulfuric) produces a TOXIC arsine gas.
For your own safety stop putting these samples into acid!
Second the article mentions this type of deposit typically runs 0.20 to 0.25 ounces of gold per ton. At these concentrations you are looking to detect by crude analytics, gold in the range of 3.5 milligrams per pound of sample. Not likely to succeed.
So while it is likely true, the geology of the region we ASSUME the OP is in may contain gold in quantities that, as Deano said, are difficult to recover. Recovering gold from these deposits will require a lot of financial investment from larger corporations experienced working these type deposits.
More important
@hodhod1403 consider the consequences of putting arsenic in acid!