A quick introduction to recognizing manganese oxide minerals in the field. The full Fieldcraft for Geologists series is here: geologyupskill.thinkific.com/
Iron and manganese oxides also "scavenge" other metals out of nearby soils and rocks, so when we take geochemical soil samples for Cu, Pb, Zn etc., we also analyse for Fe & Mn to see if they are present in sufficient quantity to be enhancing the other metal values and giving false indications of base metal mineralisation.
That's the most concentrated manganese samples I've seen since I was was a kid in the Mount Isa/ Cloncurry area. Then again. That's where this was filmed.
All these years of rock hunting and geology I always thought it was MAGNESIUM dendritic pattern within the rock. Now I know that is wrong, its exactly MANGANESE oxide dendritic patterns within the rock. Thank you for the correction GeologyUpskill!
@@GeologyUpSkill Yes, retire from absolutely everything. One should be learning (or at least attempt to do so) right up until they're in the pine box after Florida.
We saw manganese wad at the top of the Black Zone at the intermediate sulphidation Mt. Kare deposit in PNG, a smaller analogue to Porgera 15km away. It gave whopping big polymetallic anomalies. It'd sometimes have realgar and orpiment and was always with limonite so we used to code it HR in our mapping/logging for Halloween Rock ie. orange & black.........................
@@GeologyUpSkill Yes the Stage 1 B veins at Mt. Kare and Porgera are base metal carbonate. Sometimes rhodochrosite with Au bearing arsenical pyrite, galena, low Fe sphalerite and locally chalcopyrite.
True! New supplies of lithium and all the other metals required for the future energy transition will be a massive job for earth scientists of all disciplines.
I have a sample of manganese from Eagle Mountain, California, a major Kaiser mine that produced high quality iron for steel production during WW2. Do you have any information on what minor trace elements were presemt at Eagle Mountain? I also have some iron ore samples that are highly magnetic but have a fiborous green crystalene matrix around them. I also have some more solid matrix pieces of the green that have some sort of pyrite in them.
The fibrous green mineral is probably actinolite. I dont have any info on the Kaiser mine, but Manganese oxides are notorious for scavenging other metal cations from the surrounding environment so it will likely have a mixed bag. Pyrite would be unusual with manganese oxides because the pyrite would usually oxidise also.
Bingo! There seems to be a fluid event that extracts manganese from the carbonates in the Overhang Jaspilitie and dumps it in the Pilgrim Fault and related structures.
usually not. There are lots of iron oxides that can develop a black surface crust that may include some manganese, but if the streak is brown or red, it's probably dominated by goethite and other iron oxides.
@@GeologyUpSkill Thanks! There was an old manganese mine on an island made up primarily of red chert. Many sources say the island (and therefore chert) is red from manganese oxides rather than iron oxides, but I was skeptical of whether this is possible. There are clearly contrasting black clusters of manganese throughout it.
I just came back from a field work and we found tons on manganese concretions (plus Fe concretions and limonite after pyrite) but it still puzzles me what exactly was the source for that Mn. Oh well, at least I had tons of fun using my hydrogen peroxide on them hahaha
@@GeologyUpSkill I am not sure about the origin of the manganese, but in the area we mapped there were plenty of qz veins, we found limonite after py in metaquartzarenites and the area is studied exactly because it used to be (still is to some extent) a site for gold exploration. Still much to learn, though, since I'm still at the undergraduate level.
@@matheusviolante8364 dear matheus we have commercial interest in manganese mining , we are in the mining field since 35 years if have any potential reserves of manganese , if u can help in giving information we can exploration
Wow, this is interesting!
I am currently studying chemistry, and it is phenomenal to see its appearance in the world around us!
More rocks, please!
Pretty much everything comes out of the ground in some way or anothe.
Iron and manganese oxides also "scavenge" other metals out of nearby soils and rocks, so when we take geochemical soil samples for Cu, Pb, Zn etc., we also analyse for Fe & Mn to see if they are present in sufficient quantity to be enhancing the other metal values and giving false indications of base metal mineralisation.
I just like watching your videos you really broaden my horizons when it come to geology, keep up the good work Sir
The great thing about geology is the never ending supply of interesting outcrops that I find in the field.
That's the most concentrated manganese samples I've seen since I was was a kid in the Mount Isa/ Cloncurry area. Then again. That's where this was filmed.
That it is!
Thanks again for sharing this fraction of your expertise. Your videos encourage me to go to field more often.
Great. We need more geologists in the field!
Short and informative! Thank you for setting me Strait this afternoon! This helped me out!
Thanks. Glad you found the info useful.
We are exciting to see mapping from you I’m waiting 🙏🏻
All these years of rock hunting and geology I always thought it was MAGNESIUM dendritic pattern within the rock. Now I know that is wrong, its exactly MANGANESE oxide dendritic patterns within the rock. Thank you for the correction GeologyUpskill!
The day you stop learning is the day you should retire!
@@GeologyUpSkill Yes, retire from absolutely everything. One should be learning (or at least attempt to do so) right up until they're in the pine box after Florida.
We saw manganese wad at the top of the Black Zone at the intermediate sulphidation Mt. Kare deposit in PNG, a smaller analogue to Porgera 15km away.
It gave whopping big polymetallic anomalies.
It'd sometimes have realgar and orpiment and was always with limonite so we used to code it HR in our mapping/logging for Halloween Rock ie. orange & black.........................
That would suggest lots of rhodochrosite and base-metal sulphides beneath the weathering zone. I would get excited about that!
@@GeologyUpSkill Yes the Stage 1 B veins at Mt. Kare and Porgera are base metal carbonate. Sometimes rhodochrosite with Au bearing arsenical pyrite, galena, low Fe sphalerite and locally chalcopyrite.
Love the mangense oxide - just need to find some more lithium!
True! New supplies of lithium and all the other metals required for the future energy transition will be a massive job for earth scientists of all disciplines.
Awesome and informative video!
Thanks. Glad you found it useful.
I noticed that there iron oxides rocks with black dots so the manganese is associated with iron in regolith environments
Yes. Iron and manganese are close friends.
Nice information.
I have a sample of manganese from Eagle Mountain, California, a major Kaiser mine that produced high quality iron for steel production during WW2.
Do you have any information on what minor trace elements were presemt at Eagle Mountain?
I also have some iron ore samples that are highly magnetic but have a fiborous green crystalene matrix around them. I also have some more solid matrix pieces of the green that have some sort of pyrite in them.
The fibrous green mineral is probably actinolite. I dont have any info on the Kaiser mine, but Manganese oxides are notorious for scavenging other metal cations from the surrounding environment so it will likely have a mixed bag. Pyrite would be unusual with manganese oxides because the pyrite would usually oxidise also.
Fantastic. I have seen these but mistook them for haematite.
Hematite can form similar structures, but red streak will tell the difference. Manganese oxides always produce a black streak.
This wouldn't happen to be somewhere in the Overhang Jaspelite by any chance, would it?
Bingo! There seems to be a fluid event that extracts manganese from the carbonates in the Overhang Jaspilitie and dumps it in the Pilgrim Fault and related structures.
the botroidal ox magnaese is psilomelane? great video as always nick!
Yes. All of the manganese oxides in this outcrop could be lumped into the psilomelane bucket because they are hard rather than sooty.
Hi, how to distinguish massive manganese oxides from goetith?
Goethite is usually a brown colour. Manganese oxides are usually black. There is a little overlap, but it is a pretty good rule of thumb.
Thank you
Can oxidized manganese become red like oxidized iron?
usually not. There are lots of iron oxides that can develop a black surface crust that may include some manganese, but if the streak is brown or red, it's probably dominated by goethite and other iron oxides.
@@GeologyUpSkill Thanks! There was an old manganese mine on an island made up primarily of red chert. Many sources say the island (and therefore chert) is red from manganese oxides rather than iron oxides, but I was skeptical of whether this is possible. There are clearly contrasting black clusters of manganese throughout it.
How much per kilo of mangganese?
Historically, the price has hovered around USD $2000/tonne, but you need a pretty large volume to make an orebody.
I just came back from a field work and we found tons on manganese concretions (plus Fe concretions and limonite after pyrite) but it still puzzles me what exactly was the source for that Mn. Oh well, at least I had tons of fun using my hydrogen peroxide on them hahaha
If it's in veins, there is a good chance the primary mineral is rhodochrosite and that can be an indicator for gold and silver in epithermal systems.
@@GeologyUpSkill I am not sure about the origin of the manganese, but in the area we mapped there were plenty of qz veins, we found limonite after py in metaquartzarenites and the area is studied exactly because it used to be (still is to some extent) a site for gold exploration. Still much to learn, though, since I'm still at the undergraduate level.
@@matheusviolante8364 dear matheus we have commercial interest in manganese mining , we are in the mining field since 35 years if have any potential reserves of manganese , if u can help in giving information we can exploration
Sir it's nice to see your videos, where is this deposit sir,We looking to invest in mining if you suggest some big potential deposit
This one is in north Queensland near Mount Isa, but probably too small to be economic.
@@GeologyUpSkill thanks sir for your kind information
We have manganese Mines if you are interested in investment kindly let me know?
Sir. Does magnese ore attracts magnets?
No. If it attracts a magnet, you can be sure that it contains some magnetite or ilmenite (although that may be mixed with manganese oxides).
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Am interested in Mno2 high grade … pyrolusite mineral .. I need your services .. can I have your contact ?
geologyupskill@gmail.com will find me.
Where this location at????
Near the Pilgrim Fault southwest of Cloncurry
We have manganese Mines if you are interested in investment kindly let me know?