The United States has not mined tin since 1993 or smelted it domestically since 1989, according to the US Geological Survey (USGS). Net import reliance for refined tin stood at 77% of apparent consumption in 2025 [1]. The country depends almost entirely on foreign sources for a mineral classified as critical to national security and the US economy under the 2025 USGS Critical Minerals List [2]. Tin is essential to the electronics, defense, and semiconductor supply chains, serving as the primary component of lead-free solder used in circuit board assembly worldwide.
Lion Rock Resources (TSXV: ROAR | OTCQB: LRRIF) is a mineral exploration company advancing the Volney Project in the Tinton District of the northern Black Hills, Lawrence County, South Dakota. Drilling at the Volney Project confirmed the presence of a critical minerals system, including tin (as the tin oxide mineral cassiterite), lithium, and tantalum, hosted within a pegmatite system with a documented history of major tin production dating to the early 1900s [3].
This page examines the US tin supply chain, import reliance data, end-use applications, and the strategic context in which domestic tin exploration is taking place.
The US sources virtually all of its refined tin from imports. Between 2021 and 2024, the leading import sources for refined tin were Peru (31%), Bolivia (27%), Indonesia (15%), and Brazil (10%), with other countries accounting for the remaining 17% [1]. There is no active tin mine or primary tin smelter operating in the United States today.
In 2025, the US imported an estimated 32,000 metric tons of refined tin, with a customs value of approximately $970 million [1]. Apparent consumption of refined tin was approximately 43,000 metric tons, with the gap between imports and consumption partially filled by secondary recovery. An estimated 17,000 tons of tin was recycled from old and new scrap at one detinning plant and 31 secondary nonferrous-metal-processing plants, accounting for roughly 22% of apparent consumption [1].
Recycling, while meaningful, does not close the supply gap. The US tin supply chain remains structurally dependent on imports from a small number of producing countries, several of which face their own geopolitical and operational risks.
Yes. Tin is included on the 2025 USGS Critical Minerals List, which identifies mineral commodities whose supply disruption would impose significant costs on the US economy and national security [2]. The list was developed using trade disruption modeling that assesses how restrictions on imports from producing countries would affect domestic industries, GDP, and downstream manufacturing.
Tin's designation as a critical mineral reflects a combination of factors: near-total US import dependence, concentrated global production in a small number of countries, limited substitutability in key applications such as solder, and strategic relevance to the defense and electronics sectors. For a broader overview of how critical mineral designations work, see What Are Critical Minerals?
Tin is a foundational material in electronics manufacturing. Approximately half of all tin produced globally is used to manufacture solder, the metallic alloy that bonds components to printed circuit boards (PCBs) in smartphones, computers, automotive electronics, medical devices, and defense systems [4]. The industry-standard lead-free solder formulation, known as SAC (tin-silver-copper), is approximately 95.5% tin by weight [5].
In the United States specifically, tin end uses in 2025 were distributed across chemicals (25%), tinplate for food and beverage containers (16%), alloys (12%), solder (11%), babbitt, brass, bronze, and tinning (7%), bar tin (2%), and other applications (27%) [1]. Within the defense sector, tin-based solder is present in missile guidance systems, radar arrays, satellite electronics, encrypted communication hardware, and flight-control units. There is no widely accepted substitute for tin in high-reliability solder applications where thermal cycling, vibration resistance, and long-term conductivity are required.
This makes tin supply chain security a direct input to semiconductor manufacturing resilience and defense readiness. A disruption to refined tin imports would propagate through the electronics supply chain within weeks, affecting both commercial and military production.
Global tin mine production in 2025 was estimated at approximately 290,000 metric tons [1]. Production is concentrated in a small number of countries. China led with an estimated 71,000 metric tons, followed by Indonesia (61,000 metric tons), Peru (33,000 metric tons), Brazil (28,000 metric tons), Congo (Kinshasa) (27,000 metric tons), and Bolivia (15,000 metric tons) [1].
Processing is even more concentrated. A 2025 USGS fact sheet noted that China's share of global tin processing reached 50%, up from 23% at the mining stage [6]. This gap between mining and processing concentration means that even tin mined outside of China often flows through Chinese smelters before entering the global supply chain, creating a secondary layer of supply chain risk.
The United States produced zero metric tons of mined tin in 2025. USGS has noted that identified tin resources within the US, primarily in Alaska, are considered "insignificant compared with those in the rest of the world" [1]. However, this characterization does not account for tin occurrences in pegmatite systems of the Black Hills, South Dakota, where historical production occurred and modern exploration is active.
The Black Hills of South Dakota have a documented history of tin production stretching back to the 1880s. Tin (as cassiterite, a tin oxide mineral with the chemical formula SnO₂) was first discovered at the Etta mine near Keystone in 1883, triggering a period of exploration and company formation across the region [7]. The Tinton Pegmatite Mining District in Lawrence County, in the northern Black Hills, became the most significant producing area. The district produced 105,039 pounds of tin between 1903 and 1927, hosted within pegmatite intrusions that also contained lithium, tantalum, niobium, and tungsten [8].
Pegmatites are coarse-grained igneous rocks that form during the late stages of magma crystallization. In the Black Hills, these pegmatites are associated with the Harney Peak Granite (now formally known as the Harney Peak leucogranite) and are enriched in lithium, cesium, tantalum, tin, and other rare elements. The region was once the leading domestic producer of lithium and beryllium, and the same geological system that hosted those minerals also carries tin in the form of cassiterite.
A USGS bulletin authored by Frank L. Hess documented tin, tungsten, and tantalum deposits across the Black Hills in detail, noting tin occurrences in both hard-rock pegmatite veins and alluvial placer deposits in creek drainages below known pegmatite exposures [9]. The co-occurrence of tin with tantalum and lithium within these pegmatite systems is a defining geological characteristic of the district, and one that is directly relevant to modern critical mineral supply chain considerations.
Lion Rock Resources (TSXV: ROAR | OTCQB: LRRIF) holds the Volney Project in the Tinton District of Lawrence County, South Dakota. The project is situated within the same pegmatite-hosting geological terrane that produced tin, tantalum, and lithium historically. Drilling in 2025/6 intersected multiple critical minerals at strong grades over significant widths, including tin (cassiterite), lithium, and tantalum, in pegmatite-hosted mineralization at the property.
The Volney Project's location in the northern Black Hills places it within a well-characterized geological framework. The Tinton District's pegmatites have been studied by the USGS, the US Bureau of Mines, and academic researchers at the South Dakota School of Mines for over a century, providing a substantial body of geological, mineralogical, and geochemical data that supports modern exploration targeting.
The polymetallic nature of the Volney Project's pegmatite system is noteworthy in the context of tin supply chain discussions. Pegmatite deposits that carry tin alongside lithium and tantalum offer the potential for co-product recovery, where multiple critical minerals can be extracted from a single mining and processing operation. This type of deposit is rare within the United States. The supply chain dynamics for tantalum are similarly constrained; for a parallel analysis, see the US Tantalum Supply Chain overview.
For more information on the Volney Project's mineral occurrences, see the tantalum and tin landing pages. For broader context on critical mineral classifications, see What Are Critical Minerals? and the US Tantalum Supply Chain overview.
The federal government has taken several steps to address critical mineral supply chain vulnerabilities, including those related to tin. The 2025 USGS Critical Minerals List provides the statutory basis for federal agencies to prioritize tin within supply chain security initiatives [2]. The Department of Energy (DOE) has announced programs to support domestic critical mineral processing and supply chain development, including the Critical Minerals and Materials (CMM) Accelerator, which funds technology maturation and domestic commercialization of mineral processing [10].
In 2024, a US-based company with tin operations in Coatesville, Pennsylvania, was awarded $19 million under the Defense Production Act, Title III, to support the development of a domestic tin smelting, refining, and recycling facility. That company subsequently began construction of a $65 million tin metal production and processing facility in Martinsville, Virginia, with expected operations by late 2026 [1].
These developments signal growing federal attention to tin's role in the domestic supply chain, particularly as it relates to semiconductor manufacturing, defense electronics, and the broader reshoring of critical mineral processing capacity.
Disclaimer: There is no assurance that any government program, incentive, or policy will apply to or benefit the Company or the Volney Project.
Substitution options exist for some tin applications but are limited or nonexistent in others. In packaging, aluminum, glass, paper, plastic, and tin-free steel can replace tin in cans and containers [1]. In lower-performance soldering, epoxy-based conductive adhesives have been tested as alternatives. For bronze alloys, aluminum alloys and plastics can serve as substitutes in certain applications.
However, in high-reliability electronics solder, including military and aerospace-grade circuit board assembly, there is no commercially proven substitute for tin-based solder alloys. The SAC (tin-silver-copper) formulation became the global standard after the transition away from lead-based solders under the EU's Restriction of Hazardous Substances (RoHS) directive. This transition made tin even more essential to the electronics supply chain than it was previously, increasing global tin demand for solder applications and reducing the flexibility of manufacturers to substitute away from tin in the event of supply disruption.
US net import reliance (2025, refined tin): 77% of apparent consumption [1]
US domestic mine production: Zero metric tons since 1993 [1]
US domestic smelter production: Zero since 1989 [1]
US apparent consumption (2025 est.): 43,000 metric tons [1]
Estimated customs value of imported refined tin (2025): $970 million [1]
Global tin mine production (2025 est.): 290,000 metric tons [1]
Largest producer (mining): China, 71,000 metric tons [1]
China's share of global tin processing: 50% [6]
Leading US import sources (2021-24): Peru 31%, Bolivia 27%, Indonesia 15%, Brazil 10% [1]
Critical mineral designation: Yes, included on the 2025 USGS Critical Minerals List [2]
Average price (2025 est., New York dealer): 1,600 cents per pound, up 13% year-over-year [1]
Tin content in standard lead-free solder (SAC): ~95.5% by weight [5]
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The United States has not mined tin since 1993 or operated a primary tin smelter since 1989. According to the USGS, identified tin resources within the US, primarily in Alaska, have historically been considered small relative to global reserves. However, tin-bearing pegmatite deposits in the Black Hills of South Dakota produced tin in the early 1900s and are the subject of renewed exploration as critical mineral supply chain security has become a federal priority.
The primary ore mineral of tin is cassiterite (SnO₂), a tin oxide that forms in high-temperature geological environments including granite-related pegmatite systems and hydrothermal veins. In the Black Hills of South Dakota, cassiterite occurs within lithium-cesium-tantalum (LCT) type pegmatites associated with the Harney Peak leucogranite.
Yes. Tin is the dominant component of lead-free solder used to attach electronic components to printed circuit boards in semiconductor packaging and electronics assembly. The standard SAC solder alloy is approximately 95.5% tin. Tin-based solder is used in consumer electronics, automotive control systems, telecommunications infrastructure, and military hardware including missile guidance systems, radar, and satellite electronics.
In 2025, the US imported an estimated 32,000 metric tons of refined tin with a customs value of approximately $970 million. Net import reliance was 77% of apparent consumption. The leading import sources from 2021 to 2024 were Peru (31%), Bolivia (27%), Indonesia (15%), and Brazil (10%).
The Tinton Pegmatite Mining District is a historical mining area in Lawrence County in the northern Black Hills of South Dakota. The district produced over 105,000 pounds of tin between 1903 and 1927 from pegmatite-hosted cassiterite deposits. The pegmatites in this district also contain lithium, tantalum, niobium, and tungsten. Lion Rock Resources' Volney Project is located within this district.
Yes. In 2025, approximately 17,000 metric tons of tin was recycled from old and new scrap in the United States, accounting for about 22% of apparent consumption. Recycling occurs at detinning plants and secondary nonferrous-metal-processing facilities. While recycling is an important component of domestic tin supply, it does not eliminate import dependence, as the majority of US tin consumption continues to be met by foreign-sourced refined metal.
[1] USGS, Mineral Commodity Summaries 2026: Tin. Prepared by Chad A. Friedline. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-tin.pdf?v=060206
[2] USGS, Interior Department Releases Final 2025 List of Critical Minerals. https://www.usgs.gov/news/science-snippet/interior-department-releases-final-2025-list-critical-minerals
[3] Lion Rock Resources, corporate filings and news releases, TSXV: ROAR. https://www.lionrockresources.com
[4] International Tin Association, Tin Use in Solder. https://www.internationaltin.org
[5] National Institutes of Health, Environmental Health Perspectives: Lead-Free Solder Transition. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1281311/
[6] USGS Fact Sheet 2025-3038: Global Mining and Processing Production Shares. https://pubs.usgs.gov/fs/2025/3038/fs20253038.pdf?v=060206
[7] DakotaMatrix, Pegmatites of the Black Hills, South Dakota. https://www.dakotamatrix.com/content/pegmatites-of-the-black-hills
[8] Mindat.org, Tinton Pegmatite Mining District, Lawrence County, South Dakota. Smith, W.C. and Page, L.R. (1941). https://www.mindat.org/loc-44902.html
[9] USGS Bulletin 380-D: Tin, Tungsten, and Tantalum Deposits of South Dakota. By Frank L. Hess. https://pubs.usgs.gov/bul/0380d/report.pdf?v=060206
[10] US Department of Energy, Energy Department Announces Actions to Secure American Critical Minerals and Materials Supply Chain. https://www.energy.gov/articles/energy-department-announces-actions-secure-american-critical-minerals-and-materials-supply
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