According to mark stouffer the environmental program manager for california department fishing game , he stated it is the d f g view that the operation of your hand powered dredge is not a violation of sb 670 although you propose to operate it in a live stream and it does rely on vac to remove material from the bed of a stream fish and game code section 5633(1d) states" this section does not prohibit or restrict non motorized recreational mining activities , including panning for gold" while a portion of the code arguably applies to your proposed actions they quoted subsection provides an exemption for non motorized dredging.