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Identity HelpMina Santa Rosa
1st May 2012 00:49 UTCNelse Miller
1st May 2012 02:00 UTCKelly Nash 🌟 Expert
1st May 2012 03:04 UTCStephen Turner
I visited this gold mine in Panama in 2000. There is not much published mineralogical information on the mine / district. Congratulations on your collectable specimen - i didn't find anything worth keeping in my short visit. The mine was operated, not very successfully, by Greenstone Resources, which is now defunct. The project is currently held by Golden Phoenix Minerals (www.golden-phoenix.com), and their website has a lot of information, especially if you look up their 43-101 report, but probably not much mineralogical. I have attached a few extracts from my report below:
Santa Rosa comprises structurally-controlled, low-sulfidation veins and stockwork, silicified hydrothermal breccias and stratigraphic-controlled replacements in a volcaniclastic / sedimentary sequence. Gold mineralization is associated with quartz veins and stockwork, and is also disseminated in the carbonaceous sedimentary to volcaniclastic rocks. The mineralization is mixed oxide / sulfide and in part refractory with the Au apparently encapsulated in pyrite. The depth of oxidation averages about 20 m. At the Alta de la Mina pit mineralization is associated with a NW-trending fault which hosts a basaltic dike and a silicified hydrothermal breccia. Marginal wallrocks in the andesitic flows have stockwork quartz - calcite - sulfide veins. In the main Santa Rosa pit A the gold zone is more tabular, occuring at the almost horizontal contact of the bedded volcaniclastic sequence with overlying andesitic flows.
Pyrite is the most abundant sulfide mineral with lesser marcasite, arsenopyrite and pyrrhotite recorded. Gangue minerals include quartz, calcite, adularia and minor barite. Given the silver content i would expect some silver minerals are present.
Hope this helps,
Steve
1st May 2012 08:43 UTCRock Currier Expert
1st May 2012 14:02 UTCNelse Miller
2nd May 2012 01:31 UTCStephen Turner
I found a better reference as follows:
Byington, C.B. and Russell, M.R., 2001, Economic geology and ore controls of the Santa Rosa Mine – An integrated structural analysis approach, Canazas, Veraguas, Republic of Panama: Society of Economic Geologists Special Publication 8, p. 318-329.
There are two pits, Santa Rosa and Alto de la Mina.
The minerals mentioned are as follows:
acanthite
'adularia'
aguilarite
arsenopyrite
barite
calcite
celadonite
chalcedony
'chlorite'
electrum
hematite
jarosite
kaolinite
marcasite
montmorillonite
opal
quartz
pyrite
pyrrhotite
'sericite'
siderite
'tourmaline'
The 43-101 report can be downloaded from the Golden Phoenix website, which i see is now: www.goldenphoenix.us/santa-rosa-gold-mine-panama.html
SRK Consulting (US) Inc, 2011, NI43-101 Technical Report on Mineral Resources - Santa Rosa Project, Panama. Report prepared for Golden Phoenix Minerals Inc, October, 2011.
Cheers,
Steve
2nd May 2012 11:59 UTCRock Currier Expert
Thanks. Information has been added to the locality page.
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