Name 1
GRÜBLER ORE BODY (COLLECTION)
Name 2
/
ID number
002.34.Idrija
Manager / Administrator
Idrija Mercury Heritage Management Centre, Bazoviška 2, SI-5280 Idrija
Ownership
Public
Owner
Republic of Slovenia
Local / Original ID Number
No. 2 (47)
Type of Object
Ore deposit
Description
Short description
Epigenetic mineralisation in the Grübler ore body is related to the ore-bearing Grübler fault. The mineralisation appears in the form of fillings of the open fault and fractures in the zones next to the fault, the rock substitutions, impregnations, mineral top layers and differently strong moulds of superficial layers. Mineralisation is located in the Gröden sandstone (3 samples) and lower-skit dolomite (6 samples). On one piece of steel ore, we can observe the Idrialite overlay. The Grübler fault was one of the last biggest ore-bearing faults, which were excavated in the Idrija ore deposit.
Measures
/
Materials
Lower Scythian layers, Gröden sandstone
Dating
Ladinian, Longobardian
Author / Producer
/
Picture attachments
Original use
The Grübler fault is one of the strongest Mid-Triassic ore-bearing faults in the lower part of the Idrija ore deposit. It was found between the XI and XIV main levels. It was 120 m long and up to 70 m high. Next to the Grübler fault, the flint Gröden sandstone and conglomerate touched and the north-east side of the fault and the Lower Scythian sandy-micaceous dolomite was built on the other side. The Grübler fault was formed in the Mid-Triassic as one of the structural faults in the tectonic rift. In the ore-bearing phase, hydrothermal solutions flowed in on the fault, and more or less intensively covered the wider fault zone with cinnabar. Mineralisation in poorly permeable Gröden rocks was narrow and of lower quality, and significantly wider in more permissive Scythian dolomites. In Scythian rocks, the substituting of dolomite, the filling of the fault fractures and the formation of mould superficial layers occurred. The rich brick ore filled the main open fault zone. In the later tectonic phases, the Grübler ore body was strongly tectonically ruptured.
Present use
The specimens from the Grübler OB (11 in total) are being preserved, secured and presented as important natural heritage of Idrija ore deposit with exceptional universal values. It represents a unique soil “archive”, as the specimens were excavated in Idrija ore deposit and also stored. They are a part of a thematic collection “Ore bodies of the Idrija ore deposit” within the Mine Geological Collection. It is displayed in the CUDHg administrative premises, within the Francis’ shaft. The described specimens are exhibited in a display case. It can be used for temporary exhibitions and for other types of mercury heritage promotions.
Original location
Idrija ore deposit, Grübler OB
Present location
CUDHg (Mining Geological Collection), Bazoviška 2, SI-5280 Idrija
STATE OF CONSERVATION
History of conservation:
The samples are appropriately preserved. Additional interventions are not necessary. Security of the premises is taken care of.
Present state
good
Necessary activities:
Regular seasonal maintenance.
DOCUMENTATION
Addresses / collections / links etc. where further in-depth information is accessible:
- CUDHg Inventory Book;
- Čadež, Franc. Najmlajše diskordantne sedimentne kamenine na karbonskih plasteh v Idriji. Geologija, 23/2, 1980, p. 163‒172;
- Čar, Jože, Placer, Ladislav. Srednjetriadna zgradba idrijskega ozemlja. Geologija, 20, 1977, p. 141–66;
- Čar, Jože. Razvoj srednjetriasnih sedimentov v idrijskem rudišču: doctoral thesis. Faculty of Natural Sciences and Engineering in Ljubljana, 1985;
- Čar, Jože. Kotna tektonsko-erozijska diskordanca v rudiščnem delu idrijske srednjetriasne tektonske zgradbe. Geologija, 31‒32, 1988/89, p. 267‒284;
- Čar, Jože. Rudniška geološka zbirka: Seznam in opis vzorcev. Mercury Mine Idrija, 2003, p. 1–122, [material is kept in the archive of CUDHg];
- Čar, Jože. Ladinijske plasti skonca idrijskega rudišča (Z Slovenija). Geologija, 56/2, 2013, p. 151–174;
- Drovenik, Matija, Dolenec, Tadej, Režun, Bojan, Pezdič, Jože. O živosrebrovi rudi iz rudnega telesa Grübler v Idriji. Geologija, 33, 1990, p. 397‒446;
- Drovenik, Matija, Mlakar, Ivan. Strukturne in genetske posebnosti idrijskega rudišča. Geologija, 14, 1971, p. 67‒126.
- Čadež, Franc. Najmlajše diskordantne sedimentne kamenine na karbonskih plasteh v Idriji. Geologija, 23/2, 1980, p. 163‒172;
- Čar, Jože, Placer, Ladislav. Srednjetriadna zgradba idrijskega ozemlja. Geologija, 20, 1977, p. 141–66;
- Čar, Jože. Razvoj srednjetriasnih sedimentov v idrijskem rudišču: doctoral thesis. Faculty of Natural Sciences and Engineering in Ljubljana, 1985;
- Čar, Jože. Kotna tektonsko-erozijska diskordanca v rudiščnem delu idrijske srednjetriasne tektonske zgradbe. Geologija, 31‒32, 1988/89, p. 267‒284;
- Čar, Jože. Rudniška geološka zbirka: Seznam in opis vzorcev. Mercury Mine Idrija, 2003, p. 1–122, [material is kept in the archive of CUDHg];
- Čar, Jože. Ladinijske plasti skonca idrijskega rudišča (Z Slovenija). Geologija, 56/2, 2013, p. 151–174;
- Drovenik, Matija, Dolenec, Tadej, Režun, Bojan, Pezdič, Jože. O živosrebrovi rudi iz rudnega telesa Grübler v Idriji. Geologija, 33, 1990, p. 397‒446;
- Drovenik, Matija, Mlakar, Ivan. Strukturne in genetske posebnosti idrijskega rudišča. Geologija, 14, 1971, p. 67‒126.
Submitted
Mestni muzej Idrija
Submitted by
Miha Kosmač
Date Submitted
1. 3. 2018
Date Edited
Never