ORS 517.070: Certain locations subject to prior rights.

Any location of any mining claim made upon any natural stream, or contiguous or near to any placer mine, or upon or below the dump of any placer mine, shall be subject to the prior right of all mines in operation prior to the making of such location, to discharge debris, gravel, earth, and slickens which were or may be discharged at the time of making such subsequent location.