The tin museum
The tin museum, a must-visit destination for anyone interested in the art of pewter making and the history of Malaysia's pewter industry, offers a comprehensive experience that includes museum exhibits, live demonstrations, and hands-on workshops. It provides an in-depth look at the history and craftsmanship of pewter, a metal alloy primarily composed of tin.
Type of Earthcache: Mineralogy.
History of tin mining in Malaysia
Tin mining has a long and storied history in Malaysia, dating back to the early 19th century. Tin mining in Malaysia began in the 1820s in Perak and in 1824 in Selangor. The industry grew rapidly, attracting many Chinese immigrants who worked in the mines. During the British colonial period, tin mining became a major industry. After World War II, tin production surged, with Malaysia contributing significantly to the global tin supply1.
Discovery and exploitation if tin.
Bronze, an alloy of copper and tin, was discovered approximately 5000 years ago, marking the onset of the Bronze Age. Tin continues to be a significant metal in the modern world, with about half of the current tin production being utilized as solder, primarily in the electronics industry. Until 1987, Malaysia was the world's largest tin producer, at one point accounting for more half of the global production. Malaysia around 21% of the cumulative historic global tin production 27 million tonnes.
In Malaysia, tin occurs in the Western and Eastern Belts of Peninsular Malaysia. The tin deposits are directly (primary deposits) or indirectly (placers) related to granitic rocks. Cassiterite (SnO₂), a mechanically chemically resistant heavy mineral, is the only economically significant tin mineral.
In placer deposits, cassiterite grains liberated from tin lodes by weathering and transported downslope into streams, followed by deposition when the velocity of water flow decreases. Over 90% of tin produced in Malaysia came from Upper Cenozoic alluvial placers, which are primarily deposited in braided streams and piedmont fan environments. These placer deposits are mainly confined to the flanks of granite hills. The Kinta tin field, bordered easterly by the Main Range and westerly by the Keledang Range, was among the largest in the world. Tin was also found in fluvial cave placers in the Setul Limestone of Perlis and beach placers in Melaka and Lumut-Dinding, Perak.
The Rahman Hydraulic Tin Mine, a primary tin mine in Klian Intan, Perak is currently the largest tin mine in Malaysia. Tin occurs in complex vein systems (stockworks) within phyllite and is mined using the open-cast method. The quartz-cassiterite veins also contain tourmaline and pyrite, with minor galena, sphalerite, arsenopyrite, pyromorphite and bismuth.
The Sungai Lembing Tin Mine in Pahang was the world's largest and deepest underground tin mine. Mineralization occurs in the form of hydrothermal veins in shale near to the granite contact. In addition to cassiterite, the veins also contain quartz, chlorite, arsenopyrite, pyrite, pyrrhothite, spharelite, chalcopyrite and galena.
Cassiterite-bearing veins are found in many places within the granite or in the country rocks near the granite contact in the Western and Eastern Belt. Mineralization within the granite is frequently accompanied by greisenisation, where feldspar and muscovite are converted to an aggregate of quartz, topaz, tourmaline, and lepidolite by hydrothermal fluid.
Primary tin mineralization is also found in skarns, which are metamorphic rocks formed by chemical alteration by hydrothermal and other fluids. Tin-bearing skarns in the Eastern Belt are associated with iron deposits (e.g., Pelepah Kanan, Johor and Bukit Besi, Terengganu) while in the Western Belt they occur locally in the limestone bedrock of the Kinta Valley. Cassiterite also occurs locally in pegmatites and aplites (e.g. Ulu Kerling, Selangor and Gunung Jerai, Kedah).
Beneficiation of tin ore
Beneficiation in relation to tin ore refers to the various processes used to improve the economic value of the ore by removing impurities and increasing the tin content.
The first step in the beneficiation process is to crush and grind the tin ore into smaller particles. This helps to liberate the tin minerals from the surrounding gangue (worthless material).
The crushed ore is then washed to remove clay, silt, and other fine particles that can interfere with the beneficiation process. Desliming involves the removal of very fine particles that can affect the efficiency of subsequent separation processes.
Gravity separation is one of the most common methods used in tin ore beneficiation. This process exploits the difference in density between tin minerals (cassiterite) and the gangue. Equipment such as jigs, shaking tables, and spiral concentrators are used to separate the heavier tin minerals from the lighter waste material2.
Flotation is another method used to separate tin minerals from the gangue. In this process, chemicals are added to a slurry of ground ore and water to create froth. The tin minerals attach to the bubbles and float to the surface, where they can be skimmed off3.
Magnetic separation is used to remove iron oxides and other magnetic minerals from the tin ore. This process involves passing the ore through magnetic separators, which attract and remove the magnetic particles2.
After the beneficiation processes, the concentrated tin ore is dewatered to remove excess water. This is typically done using thickeners, filters, and drying equipment.
The final step in the beneficiation process is smelting and refining. The concentrated tin ore is heated in a furnace with a reducing agent, such as carbon, to produce molten tin. The molten tin is then cast into ingots or other forms for further refining and use2.
Beneficiation is a crucial step in the production of tin, as it increases the tin content of the ore and removes impurities, making the final product more valuable and suitable for various industrial applications. The main beneficiation methods for tin ore include gravity separation, flotation, and magnetic separation, each tailored to the specific characteristics of the ore being processed23.
Opening hours and admission fees.
Admission to the tin museum is free. Pre-booked tickets are not required.
Opening hours; Monday – Sunday 9am-5pm. (Including Public Holidays).
How to claim this EarthCache?
Email me the following;
1. The text "GCB38P0 The tin museum" on the first line.
2. The answers to the following questions;
- 1. In which Malaysian states can you find tin ore deposits today?
- 2. Under what other name is unprocessed tin ore known?
- 3. Find the "dulang" with tin ore. Describe the appearance of the tin ore on display; for example, is it fine or coarse-grained, what is its color, does it have luster?
- 4. Near the dulang you will find several tin concentrates. One is high in ilmenite, a byproduct of tin ore beneficiation, is its ready for smelting? If not, what percentage of tin is required for smelting?
3. Provide a photo of yourself or a personal item to prove you have visited the site.*
References
* Effective immediately from 10 June 2019, photo requirements are permitted on EarthCaches. This task is not optional, it is an addition to existing logging tasks! Logs that do not meet all requirements posed will no longer be accepted.
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1 Geology Museum, collections Geology Museum. 2 JSXC, Tin ore beneficiation methods ans some practice JSXC. 3 JSXC, Tin Ore Beneficiation Process and Equipment JSXC.