Doors Rodão and Conhal Arneiro (Nisa and Vila Velha de Rodão) (***)

I knew ... as Gates of radon, no rio Tejo, Nisa and the municipalities of Vila Velha de Rodão, candidates are the Seven Natural Wonders of Portugal and are now classified as Natural Monument?
You also know that on the left bank of Ports of radon is a magnificent Roman gold exploration, the site known as Conhal Arneiro?
The Doors Rodão, located in the municipalities of Nisa (left margin) and Vila Velha de Rodão (right bank) is a spectacular canyon epigénica Tagus river that cuts thick Ordovician quartzite countertops, that lift Sierra Talhadas or San Miguel, a bit like the Hill Our Lady of Friant (*) in Gois (already described herein).
The Tagus River, from the moment it starts to run towards the Atlantic ago 2,6 millions of years, undergoes rapid and profound fitting in the valley where several terraces form on staircase, each corresponding to ancient flood plains where sediments are deposited more or less coarse, testimonies of the power of water.
Here's the Tagus has its greatest depth (about 50 meters) caused by huge water fall that existed, since functioned as a crest of a dam wall.
Later we tried to dynamite the river extend this powerful stranglehold, because this location was the limit of navigability of the Tagus.
But beyond the spectacular grandeur of geomorphological, also true for his biology (sítio Natura 2000 with the native flora and birdlife), archaeological (Conhal Arneiro and Foz do Enxarrique) and historical (with the tower of King Wamba).

Doors Rodão

The Biology of doors Rodão
The Doors of radon, it serves me habitat for the largest colony in the country taps, are a prime location for the investigation of fauna and avifauna, which can be observed 116 espécies aves, many of them considered endangered and some rare, including most importantly the black stork, milhafre real, abutre-preto, Bonelli eagle, narceja, bufo-real, ferreirinha-mountain and flycatchers.
As this is an area with low population density, the doors of radon is still possible to observe wildlife, such as wild boar, the deer, a raposa, o ginete, a lebre, the rabbit, o saca-rabos, the wild cats and otters. To fish are also several species that predominate, highlighting the Barbo, a Boga, a Carpa, Pike, Achigã, Enguia, Perch, Tença, Lagostim, Shad and Bordallo.
On the right bank lies the castle of King Wamba or Rodão
Instead of castle will be more accurate means her waking tower or be the keep of a castle vanished. While its primitive building is traditionally attributed to Wamba (672-680), last great king of the Visigoths, probably its origin may be newer, can be traced back to the twelfth century at the time of the Christian reconquest of the Iberian peninsula by the knights Knights Templar, as seen in door with the Cross of the Order of the Temple sculpted.
From the eighteenth century until the French invasion and the tower was used as the basis of artillery to protect the passage of the Tagus river. A search 150 meters, there is a shrine erected in honor of Our Lady of the Castle.
Amazing work of gold mining in the doors Rodão
This place glimpses a wide panorama of the valley of the Tagus, especially with heaps of sterile rolled stones to prospect for gold Conhal Arneiro, on the left bank. This set is a gigantic work of Roman mining gold exploration.
The Romans, when I arrived here in the sixth century B.C., noticed that the river lost much of its ability to transport, after the passage of Doors Rodão by having encountered 6m (height) accumulated sediment. Did not take long to realize that these sands were rich in gold, which had been brought here by the waters of the Tagus!
However the task of removing the ore delicious promised to be easy: the fine sands "enriched"-were "mixed" with an enormous amount of rolled stones (quartzites) tougher and without economic interest.

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The Romans, or other their slaves, not stopped and laid down to work!
"To accomplish this endeavor was to create an authentic" industry "in place. Were constructed channels that diverted water from Ribeira de Nisa, and led it through the Sierra de S. Miguel, by a restraint system. There, the volume of water reaching enough to allow it to be channeled against the sediment after "taking them apart" pressure.
In a first step, groups separated the men rolled stones (larger) at hand, two remaining pellets, yielding visible today in the crowded landscape (some with 5 m height!). Thence, sediments were channeled along the farm through channels created for this purpose, which were built with some of the surpluses rolled stones.
These channels led the water-rich sediments (e ouro!!!) to a pond in the middle of the farm, where the minerals were concentrated. In this second phase sediments were bateados (similar to what miners do) for final separation of gold. In order not escape mg no precious metal were still another system which consisted of placing plants along the channels, where finer sediments were getting stuck. Regularly these plants were collected and burned to ashes form. The ashes were then sieved to pursue recovery of any gold that there had been!
The surplus of this process were then channeled to the Tagus through evacuation channels sterile, easily identified to the north of the farm (resemble small stones walls scrolled)

Here the land was completely bulldozed in 6 m (height). It was then that the Romans realized that the soil that was underneath them reserved a surprise: under 6 m "golden" sediment that had had peered cautiously over 15 m of sediment, with higher gold content! Other water systems below the Tagus flow here had left precious sands!
The exploration continued, forever changing the landscape of this place! Were removed 15 m of sediment in the whole area. However, in the holding center can find a piece of land untouched, that keeps their Teal of 15 m height in relation to its surroundings! The top of this elevation, known for castelejo, we have the perception of volume of explored lands. Its central position is strategic and, therefore, likely serve to control the mine and river traffic. Advised a climb to castelejo (if only to be able to pitch in cache ...) and view all the extensive heap formed by gigantic piles of pebbles, testimonies of Roman arrugiae.
This finding likely worth the investment of about 2 centuries (I A.C. a I D.C.), to remove most of 10 cubic kilometers of land.

Even in the sixteenth century, John III will warrant making a scepter of gold extracted from Portugal and Vasco da Gama a cross, showing the Venetians that Portugal had better gold than the East.
Visit the Ports Rodão is a unique moment, because it is a case where the saying of the people is hit,"Because soft water stone hard both sticking up". And so it is right to see them above, as along the bank of the Tagus river in Conhal (If you do not want to walk even nothing can drive from Arneiro: drive through dirt roads and follow the directions of Tejo / Pego Gates (cais fluvial); We could see the river dock also: the castle of radon, a ilha (that looks more like a peninsula) Source of Virtue, the mouth of Enxarrique, Sierra S. Miguel and Sierra Talhadas. Dominate in the air griffins (Gyps fulvus) s on the terra zimbro (Juniperus sp.) and the olive tree (Olea europaeae), thus completing a stunning landscape. In summer you can feel the sweet scent of cistus (Cistus ladanifer) e funcho (Foeniculum vulgare).
And the reader will vote in doors Rodão, as the 7 Natural Wonders of Portugal?
1- Text adapted hence do Wikipedia
Where to sleep: House of Covão Abitureira

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