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people online in the last 1 minutes - 0 members, 0 anon and 0 guests. (Most ever was 29 at 13:36:32 Sat Aug 3 2002) |
| kringle_mining | Re: SD#5 Structural Barrier Thanks for the comments Jim I will be dredging this portion of the creek in late May 2011 (circled area in map below). If you can find time in your schedule this Summer to come up to Ottertail and Demar for a visit, I will come down river and pick you up with the airboat. I am going up to UAF within the next couple of weeks to rock,chaulk talk with Rainer Newberry to discuss lithologies in this area, and to confirm his airboat ride. 
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| Geo_Jim | Re: SD#5 Structural Barrier Hi Kringle, Sorry it took so long for me to reply. Yes, I think you have interpreted the geology correctly. The quartz vein or rock ridge could be cutting across the valley floor acting as a dam/riffle. It sort of thing does happen. The former creek would be channeled by the outcrop and impact the gold distribution accordingly. Geo Jim:smile: |
| outnaboutnak | Re: SD#5 Structural Barrier Very interesting Kringle. I can think of several places off hand where I have seen examples of this and looking at topo's Im sure I can find more. |
| kringle_mining | Re: SD#5 Structural Barrier bump |
| kringle_mining | SD#5 Structural Barrier Below are two barriers. The horse shoe is a plunging anticlinal fold in the bedrock schist  The oxbow ponds are perpendicular to the current flow of Ottertail Creek. The shallow depth of gravels here suggest an barrier causing this topographic feature This barrier could be: 1. an up thrown fault 2. a basalt dike ( basalt bolders are found while dredging) 3. a prominent quartz vein (large boulder found while dredging) 4. Two more plunging anticlinal folds |
| kringle_mining | Re: Trapping Pay streak with Structural Barriers Here is the beaver dam. This shot was taken in 2006  Visible in the back ground beneath the three close birches is a portion of the vein. |
| kringle_mining | Trapping Pay Streak with Structural Barriers This quartz vein is 6 to eight feet wide with the apparent strikes 284 degrees and dipping 56S .  It is the structural feature that forms the finger heading up the side of the Mountain at the mouth of Demar Creek. The black on the quartz veins is mostly lichen The red line in the map below is the finger that the vein forms. See how the vein which disappears under a beaver pond blocks any concentrates from escaping into the river. Demar is walled off with a shallow hump of qtz vein.  |
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