Oh yes you can. If you are declaring a profit, then everything else is fair related to it. equipment, travel, fuel...it''s all fair game. Just don't go trying to show a "loss" for a hobby. That's a fast track to an audit.
We are both partially wrong according to what I found. Two reasons , it is possible to write off metal detecting expenses , but also because its not that simple to do or ( according to this article ) legally possible for most people.
Article is here :
http://finance.zacks.com/reporting-earnings-metal-detecting-irs-5649.html
Three things that stick out at me which limit this ability are.
1. " If you do not make a profit often enough, your business will be classified as a hobby."
2. " You claim these expenses under miscellaneous itemized deductions, but the expenses cannot exceed the amount of income you have earned from your metal detecting activities. Your miscellaneous itemized deductions also are subject to a 2 percent threshold, meaning you can only deduct the total amount of your miscellaneous itemized deductions that exceed 2 percent of your adjusted gross income."
3. " If you use your detector for fun and find primarily household items and spare pocket change, it's probably not worth your while to claim the value of what you find."
Almost everybodys expenses , except for a lucky few , have metal detecting expenses far FAR exceeding their income from metal detecting. Even if you do get lucky and find a little gold now and then.
Atleast from the information found here , for most people its not an option.
Not trying to argue , I just enjoy looking this stuff up and learn a lot from it myself.