Tin is obtained by Placer Deposits. Placer deposits are a type of mineral deposit formed by the accumulation of valuable minerals through the action of gravity and running water. These deposits are typically found in riverbeds, beaches, and other sedimentary environments.

Placer deposits are formed when valuable minerals, including tin, are eroded from their original source rocks and transported by water. As the water flows, it carries these minerals along with it, eventually depositing them in areas where the flow slows down or changes direction. This process is known as sedimentation.

Tin is primarily obtained from placer deposits because it is a heavy mineral. It is often found in the form of cassiterite, a tin oxide mineral. Cassiterite is dense and resistant to weathering, which allows it to accumulate in placer deposits over time.

Placer deposits containing tin are typically found in areas where tin-bearing rocks have been eroded, such as granite or pegmatite. These rocks often contain small amounts of tin minerals, which are released into the surrounding environment through weathering and erosion. Over time, the tin minerals are carried by water and deposited in nearby riverbeds or coastal areas.

Once the placer deposits are identified, mining techniques such as dredging or panning can be used to extract the tin minerals. Dredging involves the use of large machines to remove the sediment and extract the valuable minerals, while panning involves manually washing the sediment to separate the heavier tin minerals from the lighter materials.

In summary, tin is primarily obtained from placer deposits, which are formed through the accumulation of tin minerals eroded from their original source rocks and deposited by water. Placer deposits containing tin are commonly found in riverbeds and coastal areas and can be extracted using mining techniques such as dredging or panning.