■ Sketch of the Iki Ashibe Inclined Shaft Entrance Precise surveying completed and the shaft opening is now visible
Over two days, May 4th and 5th, precise surveying was carried out for the construction of the Ashibe Inclined Shaft in Iki. The location of the entrance and the direction of the tunnel extension were determined from the data from the previous two surveys. Based on this, this time, surveying was carried out to collect data at right angles at 50m intervals along the extension direction in order to draw a three-dimensional sketch. This will finally allow construction to begin, and we will move forward with the series of programs starting with the ground-breaking ceremony.
Last time, the site's inclined tunnel entrance was determined from two "third-order triangulation points" and named "Point No. 16." This is the tunnel entrance, and marks the starting point of the work tunnel, which runs in an "east-northeast" direction at a one-quarter gradient. This time, the site was surveyed from a third "triangulation point" to confirm accuracy and precision. Although this is a "fourth-order triangulation point," it is located at an altitude of 50m, allowing for a direct view of the site, and so supplementary data was obtained, enabling the necessary data such as latitude, longitude, distance, and angle to be obtained.
Furthermore, from this "No. 16" point, surveys were taken every 50 meters in a perpendicular direction to collect data. This allowed a rough sketch to be drawn from the entrance of the site in the extension direction. The data will be examined in detail in the future and an accurate drawing will be created soon.
The site is a terrain that descends sharply from four terraced fields to the sea to the east, and is expected to be packed with facilities such as a mine entrance, material storage area, site office, warehouse, and parking lot. Furthermore, the distance from the seabed when the mine reaches the sea, or "earth cover," is 15 meters, which leaves plenty of room. The start date for construction will be determined by how much construction funding can be raised.
[Photo] The starting point "No. 16" which will be the entrance to the mine is at an altitude of 24m. The figure visible between the trees on the right in front of the mine is the direction of the extension.
[Photo] "No. 16" 50m ahead, heading in the direction of extension. The red flag in front is 100m ahead.
[Photo] "No. 16" extends from 122m ahead, descending the cliffs of the east coast in a single go.
[Photo] "No. 16" from 100m, looking towards the entrance of the mine. The prefectural road runs east-west above.
[Photo] Surveying situation seen from the coast. The "122m" point is in the upper right. The tunnel runs 15m underground.
