OK last night I spent a few hours farming mats. I make a lot of things so I go through them. Anyway for those that are using missions,buy from the GTN, or just hunting around for hours I have a few tips for you.
Contrary to popular belief the spawn points are not random they are on a 4-5 min timer and span points for resources are actually in clusters of two to 4 within like a 10 foot radius from each other. What i mean is the mat will spawn within a like 10 ft circle (I am guessing distance but its like 2 longspur's end to end so really really close). SO you see a mat you wait 4 min after collecting it will spawn again within that circle not necessarily exact same spot. So if you farming mats here is a huge tip. Drive around collecting but make a circuit when you find a cluster don't be afraid to widen your area if you have a lot of down time between re-spawns. Expand out your route to include larger area but make sure your back to your starting point within 4 min this is key. Now this should only take one or two exploratory circles. Once you know where one mat spawn you know the area it will spawn every 4 min . I had a area last night that included 9 spawn points. I average about 8-10 resources each per pick up so in four minutes I have already mined between 63-90 resources every 4 min. So i average about 935 to 1350 an hour. That is more than enough each week. Hope this tip helps.