The others have given some good tips. If you are a good writer, it would probably be relatively easy to write in an interesting fashion about a detecting adventure without giving too many location details. Of course, it probably takes the inclusion of several photos to sell most articles, and that it where more care would have to be taken by the author. I would suggest using "tightly framed shots" where the main focus is on the ground cover,target recovery, people involved,and equipment used, while minimizing the amount of background in the photo, particularly avoiding any unique natural features or man-made structures that could serve as distinct landmarks. I know that's easier said than done, but I hope that helps! And the tip someone offered about having a trusted friend familiar with the general locale, review the article and seeing if it is obvious to them where the site is or if it is sufficiently vague enough to keep them in the dark, sounds like a good idea to me. As someone else pointed out, most people would be satisfied with the how-to (research techniques and detecting techniques) that brought you to try the site and enabled you to successfully recover some nice items, as opposed to a road map to a specific site, as long as the story is told in an engaging way that encourages the reader to imagine what it would have been like to have been there with you on the hunt.
