Without being overly optimistic, as I cannot see your sample with my own eye so to speak, gold and pyrite side by side look totally different, looking of course with eyes from experience, what you have there does indeed look like the elusive, pyrite will crumble when milled, some of the pieces in your tail by looking at the grain and form look like the real deal to me but pictures are not a reliable source when looking at fine specks.
You need a loaming dish, and a hand lens, a word of advice about assessing samples by eye, (fine pan tails from dollied samples) down here in Australia its not the best light before 10 AM and after 3 PM for looking at fine gold samples in a dish, so be careful assessing in the field and relying on ambient light.
Your mission after proving your sample is to locate an ore enrichment, gold will and can be sporadically located along a lens but will be concentrated in particular zones as mentioned in my first reply. Gold can also be more concentrated on a contact zone that is not so much on the inner quartz lens but the actual contact with the surrounding country rock(outside of the quartz) you may find high levels of mineralisation along this zone of contact.
Looks promising but you have much work to do, use the dolly pot and loaming dish and find your larger concentration point, after which you will be keen to have an assay done of some samples, sealed, tagged and numbered with a plot of the location where each was taken, including the type of sample and exactly where from. Take pictures of each rock sample, its creates an easy reference when you have your assay report.
When and if you are loaming/panning to locate the enrichment the closer you get to the source, the deeper into the ground the gold will be found when soil sampling, correspondingly the further from the source, the gold will be closer to the surface according to distance. This may be difficult considering the location, you may be stuck with crushing samples. If you do soil sampling, Plotting your loaming samples is a must, noting gold tail amount, gold grain size, What it even looks like(rough, hackly or smooth) and depth the sample was taken from. When at the source you will get consistent samples with depth the gold will be hackly, 20 metres away it will be on the surface and fine in grain.
If you are crushing samples in a dolly pot, each and every time you have a positive sample you must crush a barren sample for accuracy and avoid chasing your tail in frustration of inadvertently salting your own samples.
Best of luck, Play safe. Sample Everything!!!Not just the Quartz.