Hey Friends! I can't take credit for this, but copied it out of this Forum a couple years ago. It works well.
The following is a permission letter which I have used many time to successfully attain access to detect property for coins. You will notice that I make no mention of "sharing" my finds. I do not believe in sharing unless the circumstances are unusual. Let your conscience be your guide. Massage this letter to fit you and remember, always be neat, courteous and thankful. Best of Luck!
DATE!
Mr.XXXXXXXX
This may sound like a strange request, so let me introduce myself: My name is ............ and I have lived in ....................for ....... years. I am ....years of age, and married. Normally I would prefer to approach you in person, however I feel that a letter before hand is a better introduction than just knocking on your door at an inconvenient time and invading your privacy.
I have been engaged in the hobby of metal detecting for many years and find it a healthful, enjoyable pastime that allows me to meet many wonderful people. The thrill of finding old coins, buttons, etc. is very exciting to me.
Recently, I have researched information that your property and the area surrounding it goes back many years. I would like to obtain permission to detect on your property.
I want you to understand that I always respect the property that I search and try to leave it in the same condition that I found it. Normally the targets are no deeper than 4 or 5 inches and I retrieve them such that the ground appears not to be disturbed.
In addition, I would like to offer my services to you. Perhaps you or someone you know has lost a valuable ring, a cache or a farm tool. I would be willing to assist just for the thrill of the search.
I have enclosed a self addressed envelope for your convenience and would be happy to meet with you if further discussion is required.
Thank you for your time and consideration.
Sincerely,
(Your Name)
(Telephone Number)
.