Hoi Ha is a place on the innermost shore of Hoi Ha Wan

Hoi Ha Wan

Hoi Ha Wan or Jone's Cove is a bay at the north of Sai Kung Peninsula. It is a marine park in Hong Kong.The location has a high biological value, as it shows a high degree of biodiversity...

, Hong Kong

Hong Kong

Hong Kong is one of two Special Administrative Regions of the People's Republic of China , the other being Macau. A city-state situated on China's south coast and enclosed by the Pearl River Delta and South China Sea, it is renowned for its expansive skyline and deep natural harbour...

. It is at the north of Pak Sha O in the Sai Kung Peninsula

Sai Kung Peninsula

Sai Kung Peninsula is a peninsula in the easternmost part of the New Territories in Hong Kong. Its name comes from Sai Kung Town in the central southern area of the peninsula...

.

Hoi Ha Archaeological Site

Few coarse pottery sherds, prehistoric pottery sherds, stone implements and ceramic sherds of Tang, Ming and Qing periods were found in Hoi Ha in the two territory-wide survey.

Hoi Ha Lime Kiln

There are also the remnants of limekiln

Limekiln

A lime kiln is used to produce quicklime through the calcination of limestone . The chemical equation for this reaction is...

s. There are total 4 limekilns in Hoi Ha but only 2 remain comparatively intact; these two kilns were restored by the Antiquities and Monuments Office

Antiquities and Monuments Office

Antiquities and Monuments Office was established when the Antiquities and Monuments Ordinance was enacted in 1976, to preserve Hong Kong's monuments under appropriate protection....

 in 1982.

They are located on the eastern shore of inner Hoi Ha Wan. Limekiln industry was one of the oldest industries (1800-1939) in Hong Kong, which refined lime from either oyster

Oyster

The word oyster is used as a common name for a number of distinct groups of bivalve molluscs which live in marine or brackish habitats. The valves are highly calcified....

 shells or coral skeletons for construction and agricultural uses. In the processes, limestone

Limestone

Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate . Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera....

, i.e. calcium carbonate

Calcium carbonate

Calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found in rocks in all parts of the world, and is the main component of shells of marine organisms, snails, coal balls, pearls, and eggshells. Calcium carbonate is the active ingredient in agricultural lime,...

, in the shells and corals would be transformed into calcium oxide

Calcium oxide

Calcium oxide , commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline crystalline solid at room temperature....

by means of heating.