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15.06.2019 (3561 Clicks)

Sandvik Launch next Generation 2 Series Impact Crusher

Sandvik Mobile Crushers and Screens roll out the latest upgrade in their 2 Series product offering with the launch of the new QI442 Impactor.

13.06.2019 (3633 Clicks)

Epiroc wins Equipment Order for Mine Expansion in Chile

Epiroc, a leading productivity partner for the mining and infrastructure industries, has won a large order from construction company Züblin International GmbH Chile Spa for equipment that will be used to expand the El Teniente mine in Chile.

12.06.2019 (2672 Clicks)

Normet making History by doing Underground Explosives charging on Batteries

Normet made history by demonstrating battery electric emulsion charging in production environment underground on June 4th in Pyhäsalmi mine, Finland, with their Charmec MC 605 VE SD, for the first time in Europe. Battery-based charging makes the explosives charging process safer and more efficient, as there is no need to plug in to the mine’s electric grid.

11.06.2019 (3158 Clicks)

Epiroc to divest geotechnical Consumables Product Line to Mimir Invest

Epiroc, a leading productivity partner for the mining and infrastructure industries, has entered into an agreement to divest its geotechnical consumables product line.

11.06.2019 (2426 Clicks)

Zyfra and First Ore-Mining Company to deploy Artificial Intelligence Solutions for Mining in Extreme North

First Ore-Mining Company, a part of mining division of Rosatom State Atomic Energy Corporation, and Zyfra, Finnish-Russian digital solutions provider for heavy industries, have signed a Memorandum of Understanding on cooperation in deploying Artificial Intelligence-based solutions in mining and enrichment operations at the Pavlovskoe deposit, where there are plans to build the most northerly ore-mining enterprise in Russia.

09.06.2019 (2561 Clicks)

Disclosure on Tailings Storage Facilities

Glencore launched a microsite that provides detailed information on the tailings storage facilities (TSFs).

05.06.2019 (17 Clicks)

Robbins EPB caps 62 km of Tunneling with Final Breakthrough at Emisor Oriente

Completion of Excavation a Landmark Event for High-Profile Wastewater Line

On May 23, 2019, a celebration was in order: The last of six 8.93 m (29.3 ft) diameter EPBs had completed excavation at Lot 4 of Mexico City’s Tύnel Emisor Oriente (TEO), a feat marking the completion of ten years and 62.1 km (38.6 mi) of tunneling. “

05.06.2019 (2359 Clicks)

Robbins EPB caps 62 km of Tunneling with Final Breakthrough at Emisor Oriente

Completion of Excavation a Landmark Event for High-Profile Wastewater Line

On May 23, 2019, a celebration was in order: The last of six 8.93 m (29.3 ft) diameter EPBs had completed excavation at Lot 4 of Mexico City’s Tύnel Emisor Oriente (TEO), a feat marking the completion of ten years and 62.1 km (38.6 mi) of tunneling. “

We are proud of having successfully finished the excavation, despite all the adversities we faced, such as large inflows of water, hydraulic loads and constant changes in geology. We solved these by adapting the excavation mode according to each type of geology found,” said Hector Arturo Carrillo, Machinery Manager for Lot 4 contractor Carso Infraestructura y Construcción (CARSO).

Despite multiple challenges, the operation achieved a project record of 30 m (98 ft) in one day, and a high of 528 m (1,732 ft) in one month. It’s a result that, Carillo says, has much to do with the continuous conveyor system being used for muck removal: “It should be noted that our advance rates were achieved thanks to the great Robbins conveyor design. The tunnel conveyor was composed with elements such as the booster, vertical belt, curve idlers, and advancing tail piece, as well as elements on the surface. Personally, I think it is a great, admirable system that has helped us achieve the TBM's performance.”

The breakthrough was the latest and greatest milestone for an urgently needed wastewater project that spanned some of the most difficult geology ever encountered by EPBs. The 10.2 km (6.3 mi) long Lot 4, running from Shaft 17 to Shaft 13 at depths of up to 85 m (280 ft), included sections of basalt rock interspersed with permeable sands with high water pressure. “Our machines had to go through the worst geology, but they were designed for it,” said Roberto Gonzalez Ramirez, General Manager for Robbins Mexico, of the three Robbins EPBs and continuous conveyor systems used on Lots 3, 4, and 5 of the project.

All of the machines were designed for water pressures from 4 to 6 bars, with mixed ground, back-loading cutterheads to tackle variable ground conditions. High pressure, tungsten carbide knife bits could be interchanged with 17-inch diameter carbide disc cutters depending on the geology. Other features included man locks and material locks designed to withstand pressures up to 7 bar, a redesigned bulkhead, and Hardox plates to reinforce the screw conveyors as well as removable wear plates to further strengthen each screw conveyor flight. The rotary union joint was redesigned to improve cutter change times during cutterhead interventions, while a new scraper design offered more impact resistance in mixed ground conditions with rock.

The Lot 4 TBM was assembled in the launch shaft no. 17 and commissioned in August 2012, with the bridge and all the back-up gantries at the surface. Two months later in October 2012, after advancing 150 m (490 ft), the machine and its back-up were completely assembled in the tunnel. One month later, the continuous conveyor system was installed and running.

After 405 m (1,328 ft) of excavation, the presence of rocks, scrapers, parts of the mixing bars and other wear materials in the excavated muck prompted a cutterhead inspection. With high pressure up to 3.5 bars, it was determined that a hyperbaric intervention was necessary, and on June 2nd, 2013 the first hyperbaric intervention through an EPB in a tunnel was performed in Mexico. However, these interventions were done at great cost and proved to be time-consuming. After about 50 hyperbaric interventions the remainder of the project’s interventions were done in open air. “The interventions carried out in atmospheric mode were the biggest challenge. The great influx of water tested the limits, because we were excavating on a decline. In all of these interventions we had to implement a double pumping system, at both the TBM and the shaft,” said Carrillo. Despite the challenges of pumping water at volumes up to 180 l (48 gal) per second and cleaning fines from the tunnel each time the operation was performed, atmospheric interventions were still lower in cost and quicker than those done at hyperbaric pressure.

Even when conditions were tough, Carrillo felt his operation was well-supported by Robbins Field Service: “Robbins were always present giving ideas and contributing all their experience to solve the problems. One of the most recent examples, almost at the end of this project, was where the machine encountered a blockage to the shield and could not move forward. It became necessary to implement the exceptional pressure hydraulic system, reaching a pressure range of 596 bar on 28 thrust cylinders. Robbins personnel helped us during all that time and we were able to get through it.”

Source Text & Picture: Robbins

                     

05.06.2019 (2698 Clicks)

Endomines appoints Greg Smith to lead Endomines’ US and Finnish operations

Endomines announce that it has today, under a consultancy agreement, appointed Greg Smith to lead Endomines’ operations in the US and Finland. Greg Smith has a broad background in energy, merchant banking and resource business from more than 30 years working in senior management and executive positions.

03.06.2019 (3243 Clicks)

Geothermal energy consolidates its market uptake but much potential remains untapped

EGEC publishes its annual Geothermal Market Report

The EGEC Geothermal Market Report 2018 is being published today. This publication comes as the geothermal sector has continued its steady development. Core markets have continued carrying developments in geothermal electricity, large geothermal heating and cooling projects and deployment of small scale geothermal heating and cooling systems. Meanwhile, the use of geothermal energy has also expanded geographically with such milestones as the commissioning of Croatia’s first geothermal power plant during the year 2018.