Hi Psycho, The number one thing I would do is look at the tenement holdings in the area/s you are thinking of going to and then see what they have on their web pages. Then make contact with the company and find out from them if and if so how you will be allowed to detect on their ground. Getting...
As a geologist I would concur in saying it is tourmaline. Tourmaline can come in all sorts of colours depending on the levels of impurities. The most common is what you have found with "watermelon/spectral" tourmaline the most sort after. Tourmaline generally occurs in the later phased veining...