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clay last won the day on December 22 2017

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  1. clay

    Meteroite in situ

    Trolling – (verb), as it relates to internet, is the deliberate act, (by a Troll – noun or adjective), of making random unsolicited and/or controversial comments on various internet forums with the intent to provoke an emotional knee jerk reaction from unsuspecting readers to engage in a fight or argument. Trolling on-line forums as described above is actually analogous to the fishing technique of “trolling”, where colorful baits and lures are pulled behind a slow moving boat, often with multiple fishing lines, covering a large bodies of water, such as a large lake or the ocean. The trolling lures attract unsuspecting fish, intriguing them with the way they move through the water, thus enticing these foolish fish to “take the bait”. Not unlike unsuspecting internet victims, once hooked, the fish are reeled in for the catch before they realize they have been duped by the Troll/Fisherman. The thing about trolls is they feed on your reactions. If you don't respond they become a failure as a troll. We all want trolls to fail but as humans we just can't help responding to stupidity and false claims. The troll requires a willing victim to succeed as a troll. If you don't feed the troll it will go away and taunt people on a baking forum, a doll collecting group or a bicycling blog. You see the troll could care less what the subject is, the whole intent is to get a reaction. You guys are great troll food - you always react. It's like getting monkeys to push the button for a treat. You are the monkey and the troll gets the treat. If this is entertaining to you please keep feeding your troll. If you want to stop the stupidity ... Don't feed the troll. Yeah it's that simple.
  2. I'd watch your back Rocky. Bob's named your stone and thinks it's a girl. He's getting a little over protective if you know what I mean. Now he's made up some story about how he won't be around because he's bowing fish for a few days. I'm thinking Bob might just show up in your neck of the woods looking for "his precious". Just a heads up.
  3. Micron grinds are much finer than your typical iron oxide/aluminum mixtures. Same stuff just a lot finer material = higher heat, quicker reaction, less material needed for the job. Most Thermite is a simple mix of iron oxide powder and aluminum powder but Cadweld is copper oxide/aluminum. I don't know if that would affect the slag product composition. In theory Thermite shouldn't leave any residue but a little aluminum oxide but real life teaches us otherwise. A lot of different metal oxides mixed with pure finely divided metals can produce a thermite reaction but I think Cadweld is the only common commercial Thermite to use copper oxide instead of iron oxide. Something to think about if Rocky can find an XRF with a usable spectrum.
  4. Just to confuse the issue. Disko Island native iron in basalt. Native iron is rare and is only mined commercially in Greenland but there are other occurrences - including in the Labrador Trough just a few hundred miles north of Cape Cod. The red blobs resemble the color of micron mixed Thermite often used today due to higher energy release with less material. It could also be fused refractory clay. Or it could be slag. Occams razor and Bob say slag. ... But it's fun to speculate.
  5. The fact that portions of it were more resistant to weathering in what appears to be layers may indicate a sedimentary deposit that has been subject to metamorphism in the past. Being that it's magnetic the odds are good that iron is present in the rock. It looks like tumbled basalt with native iron. Very few localities on Earth have native iron of terrestrial origin. These native occurrences are along natural smelting zones, where magma or lava has come in direct contact with carbonaceous sedimentary rocks. In such smelting zones, reducing conditions are created, and metallic iron can crystallize. Of course it has a meteoric origin like every other rock on the planet but I doubt this one is recent enough to be considered a "meteorite" by whatever the age standards for meteorites are this year. The red spot appears to be paint? It also appears similar to the Asian black "jade" with "silver" but I'm assuming this was found in a natural setting. With no streak, hardness or fracture testing it's anybody's guess. Maybe Venusian jellybeans? Party on!
  6. Boy you have become a real party pooper Bob. I've welded with Thermite so this is not news for me but the new guy didn't know that. If you can't mess with the new guys why even post? I've been meaning to ask. What "tools" does a New Mexico bush doctor use? p.s. You don't have to answer that last one, rhetorical question. I've operated "in the bush" for many years in New Mexico. Good to have you back.
  7. Take a torch to it Rocky. If it's thermite you will know rather quickly. p.s. Have someone with you to help lead you back to your house. If it is thermite you will be blind and someone will have to put out the fire.
  8. clay

    LiDAR maps and nugget shooting

    Thanks for the reply PG-Prospecting. I haven't had much luck with SAGA except from the command line. SAGA runs on R code just like GRASS so it is possible to speed things up bypassing the clunky GUI. If I've got to use R for a process I'm more familiar and confident in GRASS. Since QGIS has achieved high integration with GRASS it's pretty easy to switch to GRASS command line while still having the advantages of a stable working platform. Most GRASS functions are available directly through QGIS without any need to use code. You could install an older version of QGIS that supports the las toolbox. QGIS can run multiple versions on most operating systems. I run several versions of QGIS just so I can use different tool sets on different projects. Each version has it's own strengths and weaknesses. The artifacts are the thin parallel scan lines running north/south, the terracing on steep slopes and the lack of ground truth extraction. All that is why most people would prefer processed LIDAR instead of raw cloud data. The real advantage to LIDAR in mapping is not so much in a bumped resolution but in it's true 3D location data. Flat maps with higher surface resolution are nice but I'm of the opinion that giving a more human point of view is the ultimate reason LIDAR will be adopted on a level like aerial photography is now. 3D interactive viewing is still in it's infancy but people are adopting it as soon as it's available. See my post above about Google Earth and Apple Maps as an example. Hillshading is pretty much necessary when presenting flat terrain maps. I like using a Northwest Angle with a medium Azimuth for flat presentation. Hillshade can be problematic when presenting 3D interactive maps. False shadows can look odd from some angles. I'm learning to use a lighter hand on the hillshade when creating 3D interactives but I've not yet been entirely happy with my results. I've employed real time relational shading on some 3D interactives and that looks really good but for the internet and your average home computer the size and processing requirements are prohibitive. If you are creating these maps for your own use consider looking into D3.js. It can do some pretty cool 3D interactive processing with minimal processor load. Your maps could provide a lot more visual information with a 3D interactive component.
  9. clay

    LiDAR maps and nugget shooting

    Google just uses regular 30 meter resolution DEMs Chris - no LIDAR. The "3D" effect on buildings and trees is a result of photogrammetry extrapolation from off angle aerial photos. That's why the trees look so funky and buildings often look "wavy". Apple just recently revealed they have spent the last 4 years doing ground level high resolution LIDAR scans and 3D photography from surface vehicles. They have now created a true 3D LIDAR based interactive map of the United States. I've seen the results and they are truly amazing. Google's 3D mapping days are numbered, when you see this new technology you will wonder why you thought Google 3D was cool.
  10. clay

    LiDAR maps and nugget shooting

    Looks like raw data. Have you tried normalizing the ground elevation for ground truth and using a tensioned spline to get rid of all those artifacts? Have you tried SPDLib or Grass to convert to DTMs? QGIS has a las toolbox but I haven't tried it yet. Interesting shading. Do you find using slope for shading gives you better information? Looks almost metallic. I'm glad you are getting use out of this cloud data. There is still a lot of resistance in the industry to government LIDAR data. Mining companies seem to prefer private aerial scans of particular areas with high density ground control. Good stuff to work with but really expensive. Keep us updated on your results, I'd be interested to see what you discover on the ground.
  11. What a great idea. Think of the depth! You could sit at home and beep nuggets on the mountain. The first real LRL. Keep a few fire extinguishers handy!
  12. clay

    Claudette mill story

    Please share your experiences with the Claudette mill Herb. I'm looking forward to hearing about old style mining and milling. Whine if you want, you've earned the right.
  13. clay

    Hand held GPS

    Something not often considered when this subject comes up is how the GPS is going to be used. If you are like me you will want to be able to operate the GPS with one hand while on the move with equipment. That pretty much limits me to the eTrex style handsets. Phones and the newer large screen GPS unit designs require two hands to operate. Another thing to consider is the new style units with larger screens, cameras, phone, touchscreen, wireless, bluetooth etc. use a lot more battery power. Most of the larger screen GPS/Phones won't last more than a day before they have to be recharged or have the batteries replaced. My eTrex lasts about 2-3 days on a set of fresh batteries and replacement of dead batteries is a two minute job instead of several hours tied to a power source (not all GPS can use off the shelf batteries). The eTrex stays in the field as long as you have fresh batteries. Very useful if you tend towards multi day expeditions. The eTrex has a great bright backlit and reflective screen (transflective) for reading in bright light. Larger GPS/Phone screens can't use that technology but they are getting better. Pay close attention to the screen technology. A GPS screen that looks great in the store but you can't read in sunlight isn't very functional in the field. After all else is considered get a Garmin no matter which model appeals to you. Garmin is the only brand that doesn't play the propriety file format game. This leaves you free to download your stored GPS data into other applications or GPS units no matter how old the data is. Garmin tend to make a better, more reliable, unit with some notable exceptions. I have two eTrex units that are more than 10 years old and working as well as new. I used to own and test quite a few GPS units. It's been a few years since I've tested new units so things may have changed but I found the two most expensive brands actually performed poorly, compared to my garmin units, in actual locational and tracking accuracy. A high price tag probably won't buy you a better unit, they all pretty much use the same GPS chip so antenna, case design and software have more influence on locational precision and accuracy than internal hardware does.
  14. It is indeed man made glass. It could be from a glass foundry but more commonly these large pieces are from commercial metal smelting operations. The silica sand used in the smelt are skimmed off the hot melt and discarded as large glass blobs. As the glass cools it tends to shatter. The white balls you see in the glass are spherulites formed from the slow cooling of the large mass of glass. It could have been found near a smelting operation in Montana or a lead smelting operation in Missouri. It all looks very much alike after they have cooled.
  15. clay

    Beryl Score.

    Schorl is an iron rich variety of Tourmaline. Tourmaline is Sodium Aluminum Boron Silicate. The crystal Homefire found very much resembles Tourmaline. Beryl is Beryllium Aluminum Silicate. I have never even heard there might be black Beryl but there is quite a bit of gray massive, non crystalline, material due to impurities and inclusions of non-beryl material. Both Beryl and Tourmaline are cyclosilcates but they are very different minerals. Their crystal structures are entirely different, Beryl crystallizes in the Hexagonal system and Tourmaline crystallizes in the Trigonal system. If you look at the crystal forms and pictures at those mineral links I think you will see that Homefire's crystal doesn't look anything like a Beryl crystal but it does very much appear to be Schorl Tourmaline.