On 13 February 2024, at the Çöpler Gold Mine in Erzincan Province, eastern Turkey, a mass of heap leach material collapsed, trapping a group of nine miners as it slid toward a creek.

The Çöpler Gold Mine is near Çöpler village in the İliç district of Erzincan Province, eastern Turkey,^[1] and is operated by Ankara-based^[2] Anagold Mining Inc. (Turkish: Anagold Madencilik San. ve Tic. A.Ş.). The company was established in 2009 as Alacer Anagold Inc. by the Turkish Lidya Mining Co. of Çalık Holding and the American Alacer Gold Corp.^[1][3] That same year construction works at the mine started, and gold production began in 2010.^[2] In 2020, Alacer Gold Corp. merged with the Canadian SSR Mining Inc., which moved its headquarters from Canada to Denver, Colorado, United States.^[4] The company's main shareholder is SSR Mining Inc.^[5]

In 2012, the company stated that it planned to extract more than 10 million ounces of gold by 2019.^[1] In 2022, the proven and probable mineral reserves were estimated at 47.7 million tonnes at an average grade of 2.11 g/t, or 3.2 million ounces of contained gold excluding stockpiles.^[6]

On 21 June 2022, a flange on a cyanide pipeline in the heap leaching field separated causing leakage, and cyanide spread into the environment. The company was fined 16 million lira (about 1 million US$),^[7] and the mine was closed for three months. Operation resumed in September the same year.^[8]

At 14:28 local time (11:28 GMT) on 13 February 2024, a huge mass of mud from the gold mine flowed through the valley in a large area.^[9] The movement was along a slope with a height of around 200 m (660 ft). It is currently estimated that the total volume of the sliding mass was about 10 million m³ (350 million cu ft), which moved approximately 800 m (2,600 ft) with an average speed of 10 m/s (33 ft/s).^[10] The mass of the landslide was equivalent to about 400,000 dump truck loads.^[11]

According to the mine workers, during routine checks at the mine site around 9 a.m., cracks were observed in the heap leaching area and reported to management. The area, where dozens of miners would normally work, was evacuated. Three mine supervisors, who went to the area in a vehicle to check, five miners in a container in the area and a driver in his truck were caught by the mud flowing down like a stream and trapped under the landslide.^[11][12]

Identities of seven of nine missing miners have been revealed. Search and rescue efforts for workers were initiated immediately. A total of 827 personnel, including 339 professionals consisting of Disaster and Emergency Management Presidency (AFAD), Gendarmerie Search and Rescue Battalion Command (JAK), Turkish Armed Forces (TSK), General Directorate of Security (EGM), miners and NGO members, took part in the search and rescue operation. In addition, 562 vehicles, five drones, two chemical defense vehicles, five ground-penetrating radar devices and five search and rescue dogs supported the operation. A vehicle tracking system was installed, and decontamination and mobile coordination trucks were deployed.^[10]

AFAD said on 15 February that search and rescue operation continued day and night without interruption; more than 2,700 personnel, aided by equipment including ground-penetrating radar and light towers, were involved in the operation.^[12] On 19 February the search and rescue operation was stopped due to increasing risk of another landslide.^[13]

After resuming the search operations, the body of the first of nine victims, a truck driver of the subcontractor company, was found in the manganese mine field after 53 days from the disaster on 6 April 2024.^[14][15] On 19 April, the body of the second miner was recovered.^[16] Two more bodies of mine disaster victims were rcovered on 4 May 2024.^[17]

As the first precaution to the cyanide danger, the culvert covers of Sabırlı Stream were closed to prevent the material flowing during the landslide from reaching the Euphrates River.^[8] A sealed pool for the surface water was created as a precaution to collect runoff water due to rain.^[18] Scientists stated that there were other risks, not just cyanide.^[19]

In order to take samples from the region and monitor them continuously, a team of ten experts from the Ministry of Environment, Urbanisation and Climate Change, including two georadars, one multistation, two mobile devices with two sets of monitoring devices and a mobile laboratory, were immediately dispatched to the region.^[18]

Four public prosecutors were assigned to investigate the cause of the accident. An eight-member committee consisting of experts in geology, occupational health, mining, construction, agriculture, environment, mapping and chemistry, was set up to report to them.^[12] Four employees were detained immediately, and later three more mine officials, among them a company manager of Canadian nationality, were taken into custody.^[18] On 15 February the number of detainees was increased to eight.^[11][12]

The eight suspects were put before the magistrates' court after their statements at the prosecutor's office. Six of the suspects, including the Canadian national company manager, were arrested, and two suspects were released on probation.^[20]

On 7 March, the Turkish Bars Association stated, referring to the Constitution of Turkey and the European Convention on Human Rights, that "the mine disaster clearly violated the rights to life, health and living in a healthy environment and caused nine miners to lose their lives". It called for public and company officials to be tried "according to the private law, administrative law and the Turkish Penal Code. It is clear that it should be evaluated within the scope of pollution crimes."^[21]

It is claimed that according to a 67-page report, prepared by an international auditing company, and forwarded to all mining company officials, "the signal system indicating the vibrations on the ground was broken."^{[clarification needed]} It was noted that a signal disturbance was detected in the leach field one day before the landslide.^[19]

The prosecutor's office stated that "the most important reasons for the landslide are increasing the amount of solution introduced into the soil, the leach heap is twice as large as it should be, and regular dynamite explosions every day at 12 hours." It was added that "dynamite was detonated at noon, and the violence gradually increased even the area was evacuated due to the detection of a crack."^[19]

Scientists from the Landslide Application and Research Center at Karadeniz Technical University used a drone to measure the height of the leach pile remaining after the landslide as 257 m (843 ft), much higher than the world standard controllable level of 150 m (490 ft).^[22]

Immediately after the disaster, a delegation from the Chamber of Mining Engineers of Turkey went to the mine to investigate. The delegation was not permitted to enter the mine area, and was refused technical information. The Chamber said the mine should be closed and its operating licenses cancelled because:

• The main reason is the increased load on the leach pile, resulting from a doubling of mining capacity, to a level of making it very difficult to ensure stability.
• A second and third heap leach area was not created to avoid costs and with the ambition of more profit, despite the warnings of the workers and the occupational safety expert. The Ministry of Environment, Urbanisation and Climate Change, which gave permission and did not fulfill these duties despite having the responsibility of monitoring, is the main responsible for the disaster.
• In order to monitor the possible effects on the environment and human health of approximately 10 million m³ of cyanide and heavy metal-containing heap flowing from the heap leach area onto the permeable natural environment, a groundwater map of the region should be prepared, and samples should be taken periodically from the impact area, control wells, Sabırlı stream and the Euphrates River. Measurements need to be made and the results must be shared transparently with the public.
• Subcontractors in the mining operation disrupt the integrity of the business, prevent coordination, and cause irreparable problems.
• Search and rescue activities must be carried out by expert miner teams under the supervision of mining engineers and not by AFAD personnel, who do not have any professional experience and expertise.
• Gold mining should be included in the scope of strategic mines and operated by the public.^[23]

A new regulation that came into force on 19 March 2024, increased the compensation amount to be paid to the relatives of miners, who lost their lives in mining accidents, from ₺ 150,000 (approx. US$ 4,600) to ₺ one million (approx. US$ 30,800). However, the relatives of the nine miners, who remain under the landslide, can not benefit from this regulation because the accident occurred before the date of entry into force. Additionally, compensation payments can be made to the relatives of the nine miners through the Social Security Institution and private insurance.^[24]