Since the beginning of this year, the spot treatment charge market for copper concentrates has shown an unprecedented and severe downward trend. The SMM Copper Concentrate Spot Index has fallen from -45 USD/dmt at the start of the year to near -70 USD/dmt, with the speed and magnitude of the decline being historically rare. A negative treatment charge means that when smelters purchase copper concentrates, they not only fail to receive traditional processing income from miners but instead must pay the sellers. Based on the current TC of -70 USD/dmt, the actual cost smelters pay sellers in the copper smelting process is equivalent to a TC of 70 USD, or further converted to a TC+RC of approximately 112 USD. This extreme price signal has quickly drawn high market attention to smelter profitability and even sparked concerns about the sustainability of domestic copper smelting production. Despite treatment charges falling to historic lows, copper cathode production by Chinese smelters remains at high levels, currently around 1.2 million tons per month. This phenomenon of "producing more while losing more" appears, on the surface, to contradict market logic, but actually reflects smelters' passive choices and structural supporting factors in the current complex environment. Historically, extreme treatment charge scenarios are not unprecedented. In past industry downturns, smelters often relied on one or several factors—exchange rate fluctuations, rising sulfuric acid prices, or treatment charges themselves—to barely maintain cash flow balance. In the current cycle, the sharp rise in sulfuric acid prices has become a key variable supporting smelter survival. Currently, the ex-factory prices of smelter acid sold by domestic copper smelters generally range from 800 to 1,600 yuan per ton. The latest SMM Copper Smelting Acid Index stands at 1,235.5 yuan/ton. As a crucial byproduct of copper smelting, sulfuric acid price fluctuations significantly impact smelters' comprehensive earnings. Typically, smelters produce approximately one ton of sulfuric acid for every dry metric ton of copper concentrate processed. Based on the current sulfuric acid price of 1,235.5 yuan/ton, after deducting value-added tax (at a 13% rate) and converting to US dollars (using an exchange rate of 6.9), each ton of sulfuric acid can contribute about 158 USD in revenue for the smelter, equivalent to an additional 158 USD per dry metric ton of copper concentrate. If further converted to the TC+RC metric, this amounts to about 99 USD. Thus, the rise in sulfuric acid prices has significantly offset the loss pressure from negative copper concentrate treatment charges, with some more efficient smelters even achieving marginal profitability. It is precisely this "stabilizer" role of sulfuric acid that allows smelters to maintain high operating rates under extreme treatment charge conditions. However, the support of sulfuric acid for smelting profits is not unlimited, as its price trend is itself influenced by more complex international geopolitical factors. The recent sharp escalation of the Middle East situation has brought significant uncertainty to the global sulfuric acid and sulfur supply chain. Since the joint US-Israeli military strike against Iran on February 28, 2026, the Strait of Hormuz, the world's most critical energy transport route, has rapidly fallen into a severe transit crisis. After taking office, Iran's new Supreme Leader, Mojtaba Khamenei, immediately declared that the strait would remain closed as a strategic lever against the US-Israeli alliance and suggested that neighboring countries close US military bases. The Islamic Revolutionary Guard Corps subsequently explicitly announced a ban on any vessels associated with the US or Israel from passing through the Strait of Hormuz, warning of severe consequences for unauthorized passage. The Strait of Hormuz is a critical chokepoint for global sulfur transport. Statistics show that before the conflict, over 100 ships passed through the strait daily. However, after the conflict erupted, transit traffic plummeted by over 90%, with extreme cases of no ships passing for an entire day, leaving over 3,000 vessels stranded in nearby waters. This effective blockade has not only directly impacted the crude oil market—with Brent crude futures rising over 50% within a month to exceed 114 USD per barrel—but has also severely disrupted the global supply chain for sulfur and sulfuric acid. War risks have caused shipping insurance costs to soar to over 20% of the cargo value, further increasing logistics costs and plunging global sulfur supply into a logistical crisis. Although Iran claims to allow passage for vessels from "non-hostile" countries, requiring them to obtain prior permission, actual transit volumes remain extremely low, far below global trade demand. Simultaneously, the Houthi armed group in Yemen has announced its involvement, posing new security threats to the Red Sea-Suez route. The compounding pressure on the two major shipping chokepoints of the Strait of Hormuz and the Red Sea is posing a systemic challenge to the global supply chains for energy and chemical raw materials. As the primary raw material for sulfuric acid production, the disruption in sulfur supply directly drives international and domestic sulfuric acid prices progressively higher. Given the current situation, geopolitical conflicts show no signs of easing in the short term, implying further room for sulfuric acid price increases. The continued rise in sulfuric acid prices will have a dual impact on the domestic copper smelting industry. On the one hand, increased sulfuric acid revenue will continue to provide crucial profit supplementation for smelters, enabling them to maintain production even at lower TC levels and potentially further depressing spot copper concentrate treatment charges. On the other hand, this surge in sulfuric acid prices, driven by geopolitical conflict, also makes smelter profitability highly dependent on external unstable factors, rendering the industry's overall risk resilience increasingly fragile. Notably, the extreme treatment charge environment has begun to have a tangible impact on the global layout of copper smelting capacity. Mitsubishi Materials of Japan recently announced its plan to cease operations at its Onahama copper smelter by the end of March 2027. The smelter has a crude and refined capacity of 230,000 tons, and the main reason for the closure is precisely the intensified competition in the global copper smelting industry, leading to a sharp deterioration in copper concentrate TC/RC and persistent pressure on business prospects. This decision sends a clear signal: against the backdrop of continuously bottoming treatment charges and industry profits highly dependent on byproducts and external environments, some high-cost smelting capacity or those lacking comprehensive recovery capabilities are facing pressure to exit the market. In summary, China's copper smelting industry is currently at a highly unusual cyclical juncture. On one hand, smelters, benefiting from high sulfuric acid prices, have temporarily weathered the impact of negative treatment charges, maintaining high output. On the other hand, sulfuric acid prices themselves are heavily dependent on geopolitical situations, and external variables like the Strait of Hormuz blockade introduce significant uncertainty into the sustainability of smelting profits. If tensions in the Middle East persist, sulfuric acid prices may continue to rise, leaving room for TC to fall further, potentially enhancing smelters' tolerance for extreme treatment charges in phases. However, if geopolitical tensions ease, sulfur supply chains recover, and sulfuric acid prices retreat from their highs, smelters would face the risk of a "double blow" from both low treatment charges and reduced byproduct revenue, potentially heralding a genuine phase of capacity reduction and deep adjustment for the industry. Therefore, the current apparent "resilience" of the copper smelting industry is essentially built upon a fragile balance between geopolitical factors and the byproduct market. For market participants, besides monitoring TC trends, it is crucial to closely track changes in sulfuric acid prices and the underlying geopolitical factors to make more accurate judgments regarding the production sustainability and profitability prospects of the smelting industry.

[SMM Analysis: The Copper Smelting Industry Faces the Test of Extreme TCs, with Sulphuric Acid and Geopolitics Becoming Key Variables] Since the beginning of this year, the spot market for copper concentrate TCs has shown an unprecedentedly sharp downward trend. The SMM spot copper concentrate index has fallen all the way from -$45/dmt at the start of the year and is now approaching -$70/dmt. Both the speed and magnitude of the decline have been historically rare. So-called negative TCs mean that when smelters purchase copper concentrates, they are not only unable to obtain traditional processing income from miners, but instead must pay fees to the seller. Based on the current TC of -$70/dmt, the cost that smelters actually need to pay to the seller in the copper smelting process is equivalent to a TC of $70, or further converted to a TC+RC of about $112. This extreme price signal has quickly triggered strong market concern over smelter profitability, and has even begun to raise worries about the sustainability of production in China’s copper smelting industry.

This week, the macro market still repeatedly traded around the Middle East situation and expectations for the US Fed. At the beginning of the week, tensions among the US, Israel, and Iran eased slightly, the US dollar pulled back, and risk appetite recovered temporarily, allowing copper prices to stop falling and rebound at one point. However, Iran later denied progress in the relevant negotiations, geopolitical tensions tightened again, international oil prices rose sharply, and market concerns over supply disruptions in the Strait of Hormuz resurfaced, with safe-haven sentiment rebounding accordingly and weighing on copper prices. Market bets on major central banks cutting interest rates this year were pushed back significantly, and expectations for macro liquidity weakened at the margin. Overall, this week’s copper price logic still centered on the repeated tug-of-war among geopolitical risks, oil prices, the US dollar, and interest rate cut expectations. Before macro uncertainty eases materially, copper prices will likely remain in the doldrums with rangebound fluctuations in the short term. Fundamentally, the logic of ore supply tightness continued. On March 25, Mitsubishi Materials announced that it will cease part of the copper concentrates processing business at the Onahama smelter in 2027, and explicitly mentioned the sharp deterioration in TC/RCs and pressure on smelting profits, further confirming the current reality of tight copper concentrates supply and continued damage to profitability on the smelting side. Global exchange copper inventories remained high, but demand in China had already started, and the pace of destocking in China’s social inventory exceeded market expectations. Supported by the opening of the import window and domestic demand, inventories outside China showed signs of flowing back into China. Looking ahead to next week, the macro theme is expected to remain largely unchanged. If the Middle East situation does not ease substantially, elevated oil prices and a relatively strong US dollar will likely continue to weigh on copper prices, and short-term resistance will remain; however, ore supply tightness, worsening smelting profits, and domestic demand will still provide some support for copper prices. Therefore, copper prices are expected to continue to fluctuate rangebound within a narrow range next week, with LME copper expected at $12,000-12,500/mt and SHFE copper expected at 93,000-96,500 yuan/mt. In the spot market, as imported cargoes arrive one after another, the pace of domestic inventory destocking may slow down. Although inventories are still being drawn down, spot premiums are expected to find it difficult to rise sharply due to the relatively high inventory base. Spot prices against the SHFE copper front-month contract are expected at a discount of 120 yuan/mt to a discount of 20 yuan/mt.

Mitsubishi Materials Corporation said on Wednesday that it had decided to cease the processing of copper concentrates at the Onahama smelter and refinery, as well as the operation of related smelting facilities, by the end of March 2027.In a statement, the company said the outlook for the related business had become increasingly uncertain due to intensifying competition from overseas smelters and a sharp decline in treatment and refining charges (TC/RCs) for copper concentrates.The company said in a statement that it expected to record an impairment loss of 21 billion yen in Q4 of the current fiscal year ending this month, mainly related to the smelter's fixed assets.

[SMM Rare Earth Bulletin] Japanese Prime Minister Takaichi Sanae and US President Trump reached an agreement under which both sides will strengthen cooperation on critical minerals to enhance supply chain resilience. The two countries signed a preliminary agreement to jointly develop deep-sea mineral resources, including rare earth-rich mud resources around Minamitorishima. The Ministry of Economy, Trade and Industry and the Department of Commerce will establish a working group to advance technical cooperation on projects involving rare earth mud and manganese nodules. In addition, Mitsubishi Materials is cooperating with US-based ReElement Technologies on a project in Indiana to recycle rare earths from waste magnets.

Frontier Lithium announced that it has signed a Memorandum of Understanding (MoU) with Panasonic Energy and Mitsubishi Corporation to explore potential collaboration in developing the North American battery supply chain. Under the agreement, Panasonic Energy has expressed interest in procuring lithium hydroxide from the PAK Lithium Project in Ontario, Canada. The project, which is being advanced through a joint venture between Frontier and Mitsubishi, plans to develop an upstream lithium mine and mill as well as a downstream lithium conversion facility. The project is expected to begin producing approximately 20,000 tonnes of battery-grade lithium salts annually starting in 2030.