TOURS.ID - Lorentz National Park
Nearly five years of Revelation Sunyoto surround 2.5 million hectares of forest in Timika, Papua, on the air. At that time, in the period 1989-1994, Rev. work conduct aerial surveys to make a geological map in the concession. Freeport Indonesia. When I was young, aged 31-32 years, "said Wahyu, Practitioner Mineral Exploration and Mining Precious and Base Metals.
When the Rev. become part of the Exploration Division Team of PT Freeport Indonesia. He along with 12 others continuously conduct aeromagnetic survey or surveys make geological maps using a plane or helicopter. Aerial surveys conducted with a capital of landscape photographs and topographic maps printed Timika in 1967. The topographic map has already been created by the United States Air Force. From a helicopter to an altitude of 200-400 meters above the ground, Revelation acted as navigator while mapping.
In addition to making aerial
surveys, the team also took to the field to examine the rocks. The area
targeted one river, usually when a mountain or hill gold reserves, will carry
over into the river. The stones are collected is then taken to the
laboratory for examination kadungannya. From the survey results, the
exploration team found several distribution points igneous intrusion or
potentially containing minerals. This intrusion of which are spread across
several areas Ilaga, within 16 to 60 kilometers from the area managed by
Freeport Grasberg mine.
Freeport made a geological map
to find out the potential in the concession. Under the agreement a
contract of work, gradually release Freeport concession. After mapping,
Freeport release that are considered less profitable areas. Freeport in
the early days working contracts in 1967 had a concession area of 2.5 million
hectares, is now reduced it to 212 thousand hectares. Reduction of the
area of Freeport automatically reduce the burden on the tax concession.
Three Point Intrusion
Results of aerial surveys conducted Freeport is now part of the national geological maps issued Geological Research and Development Center in 1995. Up to now there is no match for renewing map made aerial survey of Freeport. Timika sheet geological map with a scale of 1: 250,000, it was seen three intrusions are characterized by reddish brown color. Judging from the map, the three points were within 16 to 60 kilometers from the Grasberg mining areas.
Like a similar intrusion
located at Grasberg, Freeport Erstberg and other mining areas. It was like
the height of the point of intrusion 3,000-4,000 meters above sea level and is
located in a row of the Central Mountains. This intrusion attention of
scientists in the country. A group of scientists estimates, potential
mineralization in the intrusion does not differ greatly from those in Grasberg
or Erstberg.
In the geological map was
mentioned a description of intrusion of diorite, quartz diorite, monzonite,
quartz monzonite, stocks, dikes, sills. While the primary igneous
intrusion at Grasberg and Erstberg is is monzodiorit and diorite. According
to the Director of the Center for Strategic Indonesian Resources
Studies (Ciruss) Budi Santoso, in the 1990s the mining and geological
scientists been widely mentioned potential mineralization in the area near the
Freeport mine.
According to Budi, the
conversation was interrupted because at the same time there is increased
pressure from environmental activists to make the area as a conservation area. In
1997, the area was designated as the Lorentz National Park, which includes
three points that have the potential mineralized intrusion.
Lorentz National Park
Determination of Lorentz
National Park, just two years after the geological map sheet Freeport Timika
survey was published. The forest area as a national park it automatically
restricts public access, especially for those who intend to explore. Two
years after designated as national or regional in 1999, the United
Nations Educational, Scientific and Cultural Organizations (UNESCO)
designated it a World Heritage Site with a coverage area of approximately 2.4
million hectares.
National Park became the
largest protected area in Southeast Asia, stretching from the snow-covered peak
Jayawijaya mountains with an altitude of 5,030 meters below sea level, to
stretch out to the borders of Arafuru Sea waters. Lorentz name taken from
the name of a Dutch explorer, Hendrikus Albertus Lorentz, who visited the area
in 1909. In addition to biodiversity, protected forest area that is also home
to the lives of nine indigenous people of Papua.
Source: CNNIndonesia
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