John- Grew up in the Susanville/Quincy area. Would suggest Indian Creek along Hwy 89. Also might try any streams flowing north out of the Antelope Res. area out toward Janesville. Check to see about active claims before doing any prospecting.
Good chance there might be something coming down in the Janeville area from up above since there are GPAA claims up above Taylorsville and that area has a rich mineral history.
Indian Creek and Spanish Creek will have gold as they drain that area and the area down around Quincy and the Bucks Lake area (more claims in that area).