Comparative laboratory study of conventional and Electric Pulse Fragmentation (EPF) technologies on the performances of the comminution and concentration steps for the beneficiation of a scheelite skarn ore

Bru, Kathy; Beaulieu, Mickael; Sousa, Rui; Leite, Mário Machado; Sousa, Ana Botleho de; Kol, Erdogan; Rosenkranz, Jan; Parvaz, Daniel B.

doi:10.1016/j.mineng.2020.106302

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…The operating parameters that can be changed are the discharge voltage, electrode gap, pulse repetition rate and number of electric pulses applied to the sample, with treatment conditions for this work listed in Table 1 . Further information on the Lab system can be found in 89 .…”

Section: Methodsmentioning

confidence: 99%

A rapid change in magma plumbing taps porphyry copper deposit-forming magmas

Carter

Tapster

Williamson

et al. 2022

Sci Rep

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Porphyry-type deposits are a vital source of green technology metals such as copper and molybdenum. They typically form in subduction-related settings from large, long-lived magmatic systems. The most widely accepted model for their formation requires that mantle-derived magmas undergo an increase in volatiles and ore-forming constituents in mid- to lower crustal reservoirs over millions of years, however, this is mostly based on observations from shallow, sporadically exposed parts of porphyry systems. To examine this paradigm, we have evaluated the timeframe and geochemical signatures of magmatism in a ~ 8 km palaeodepth cross-section through plutonic and volcanic rocks of the classic Yerington magmatic system, Nevada. We show that the magmas in the upper parts of the system (< 8 km) underwent a major and rapid change in chemistry over a period of < 200 kyrs that is coincident with the initiation of ore formation. We attribute this change to a shift from extraction of quartz monzodiorite and quartz monzonite magmas evolving in mid-crustal reservoirs, and that had relatively poor ore-forming potential, to extraction of volatile-rich granitic magmas from greater (~ 30 km) depths. As the granites crystallised, late stage melts were intruded through the carapace as aplite dykes which contain traceable expressions of the porphyry deposit-forming fluids. The rapid nature of the shift in ore-forming potential narrows the temporal-geochemical footprint of magmas associated with porphyry mineralisation and provides new constraints for exploration models.

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Section: Methodsmentioning

confidence: 99%

A rapid change in magma plumbing taps porphyry copper deposit-forming magmas

Carter

Tapster

Williamson

et al. 2022

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…The operating parameters that can be changed are the discharge voltage, electrode gap, pulse repetition rate and number of electric pulses applied to the sample, with treatment conditions for this work listed in Table 1. Further information on the Lab system can be found in 74 . the SELFRAG open process vessel.…”

Section: Electric Pulse Fragmentation (Epf)mentioning

confidence: 99%

An abrupt switch in magmatic plumbing taps porphyry copper deposit-forming magmas

Carter

Tapster

Williamson

et al. 2021

Preprint

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Porphyry-type deposits are a vital source of green technology metals such as copper and molybdenum. They typically form in subduction-related settings from large, long-lived magmatic systems. The most widely accepted model for their formation requires that mantle-derived magmas undergo a multi-million year timescale ramp-up in volatiles and ore-forming constituents in mid- to lower-crustal reservoirs, however this does not explain why porphyry deposits are absent from the vast majority of arc magmatic systems. To address this, we have carried out geochemical and geochronological studies on the tilted, ~8 km depth equivalent, cross-section through the classic Yerington magmatic system, Nevada. Here we show that the magmas underwent a major and abrupt change in chemistry over a period of 100 kyrs which is coincident with the initiation of ore formation. This is attributed to a wholesale switch in the magmatic plumbing system whereby volatile-rich granitic melts were extracted from an estimated ~30 km depth and transported to shallow levels (~3-8 km) where exsolving fluids were focussed through highly permeable pathways to form porphyry deposits. The change in magma chemistry is documented across the entire plutonic to volcanic record. Its rapidity suggests that the increase in a magma’s ore-forming potential is not solely driven by tectonic factors, that occur over multi-million year scales, but through internal processes within the melt evolution zone, operating at more than an order of magnitude faster than previously envisaged. This short timescale narrows the temporal-geochemical footprint of magmas associated with porphyry mineralisation which will aid in targeting the next generation of ore deposits.

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“…An example of this type is the FRANKA series of generators (Institute for Pulsed Power and Microwave Technology, Karlsruhe, Germany) which includes the laboratory facility FRANKA 0, with an output voltage of up to 250 kV, energy storage of 750 J and a pulse repetition rate of up to 5 Hz and the prototype industrial facility FRANKA 2 (FRANKA-Stein), with an output voltage of up to 350 kV and performance of up to 280 kg/h [2]. Many laboratories around the world use SELFRAG LAB systems (SELFRAG AG, Switzerland) [9,[11][12][13][14][15], which are also based on the Marx generator. A SELFRAG LAB system has the following parameters: operating voltage 90-200 kV, frequency 1-5 Hz, pulse front 150 ns.…”

Section: Introductionmentioning

confidence: 99%

An air insulated linear pulse transformer for electrodischarge technology

2021

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A linear pulse transformer with air insulation at atmospheric pressure was created and tested under both constant resistance and non linear loads. The maximum power of the transformer output pulse reached ∼500 MW at a matched load with a charge voltage 50 kV. The transformer transferred ∼60% of the stored energy to the load over a characteristic time of about 1 μs. The scalability the generator was studied by connecting two identical transformers in series which gave a power output of ∼850 MW with doubled output voltage and reduced current. The frequency mode of operation was studied using one and two transformers with a charge voltage of 50 kV and a load that was, close to matched. In both cases, the power maximum and jitter showed no significant changes at any of the frequencies tested (up to 5 Hz). These results mean that the use of this generator can be recommended for a wide field of applications due to its scalability and low internal impedance.

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Comparative laboratory study of conventional and Electric Pulse Fragmentation (EPF) technologies on the performances of the comminution and concentration steps for the beneficiation of a scheelite skarn ore

Cited by 6 publications

References 22 publications

A rapid change in magma plumbing taps porphyry copper deposit-forming magmas

A rapid change in magma plumbing taps porphyry copper deposit-forming magmas

An abrupt switch in magmatic plumbing taps porphyry copper deposit-forming magmas

An air insulated linear pulse transformer for electrodischarge technology

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