SUPERIOR SLATE QUARRY

Superior Slate Quarry



Superior Slate Quarry

Introduction

Again, no shortage of accidents despite the constant monitoring of the walls of many crimes and fault planes. In 1888, Misengrain, a large piece of slate from the roof comes off and causes the death of 18 miners. This technique, abandoned for obvious security reasons, is still revived Renazé to mine, and then Misengrain The Poueze in the 1980s. The vault is then monitored and secured with modern tools that can prevent accidents.

Generally, the slate is now less used because of the emergence of synthetic building materials cheaper, some imitation slate. The slate was also widely used as a thin plate as a support for writing erasable. The life of a slate of 70 years to 300 years. The quality of the deposit, the type of extraction (machine or hand) and of course the thickness, the type of installation (on hook or studded), the gauge, affect this duration. There is virtually no maintenance (defoaming) on the slate. For more reliable, it will change the media before the slate (or even change batten framing). That's why there's a market for used slate, and the historical monuments (their architects and craftsmen) advocate renovation slates to long life. The slate of poor quality are prone to rust. This defect arises from the presence of iron ore (the most common form is that of pyrite, but also meets with garnets, the magnetite ) content in some veins of the deposit or dispersed (Forte, Hartnett & Sevetson, 2011). So, after extracting the defective batches can be systematically set aside by an acid test.

Discussion

In the Middle Ages, people began to extract the slate in the traditional way for regional construction. Taken directly from the outcrop, in Anjou, it is not traded. One must also distinguish the soft-grained slate, but less resistant, slate lasts, the less easy to divide, but stronger. Sitting on the floor, one leg bent on the other, the slate up the chisel in the thickness of the block and strike small blows with the mallet to start the slot. He repeats this maneuver along the room. The slot and started around the sheet, he strikes a sharp blow to a selected point and so it separates the two layers thinned.

It is a stone carcarifica and very compact, color leaden - blackish and workable. Slate tends to clear up from their extraction to take a light gray pigment, the darker shade being due to excess carbon that evaporate when in contact with oxygen, moisture and ultraviolet radiation (Burns, 2007). By virtue of their schistosity (ie the ability to split into slabs) and properties, can be used in various segments of both traditional and industrial ' architecture and of ' building (for roofing, flooring, stair steps) as in art in the design and household objects of everyday use.

Resistant, waterproof, durable: slate itself as a roof covering performance. Widely used in the Paris region, in Brittany, the Pyrenees or the Ardennes, it also appeals made by ...