Circular economy

As part of the rehabilitation and revegetation of mine sites, seeds and fertilizers are needed in large quantities. Fertilizers in particular must be imported from mainland France, this transport has an economic cost but above all an enormous environmental cost. It would therefore be interesting to be able to find within the Guyanese territory alternatives to these fertilizers.
For several years now, SMSE has been trying to develop this concept of circular economy among the various players in Guyanese industry and agriculture. The objective is to recover the different materials, considered as waste (ash, manure, bagasse, seeds...), resulting from the transformation processes and to recover them on the mine site where they could find a use in the rehabilitation process.


A large variety of seeds can already be harvested at the mine site within the living base or at the edge of the forest. Only, the quantities are sometimes insufficient. It is therefore interesting to be able to obtain seeds in large quantities from Guyanese producers.

Palm seeds :

Many palms, including wassai, are used in the food industry. It is therefore easy to recover huge quantities from producers. SMSE is already in contact with a wassai juice producer: O Rey Do Açai, located in Cayenne.
In addition to its interest in revegetation, wassai seeds also have a very interesting agronomic interest. Indeed, the additional quantities of seeds can be used as fertilizer.


Seeds of fruit trees :

In the same way as for the wassai, fruit trees are widely cultivated by the Guyanese food industry.
SMSE is in contact with Délices de Guyane to source seeds, resulting from the process of processing their different products (juices, jams...).

wassai (1)

170512 Graines cerisier péyi

Industrial wastes

The soil from the mine site is depleted by mining. It is therefore necessary to enrich it with fertilizers to allow an optimal development of the plant species produced on the mine. However, it would be interesting to replace these chemical fertilizers from mainland France with organic fertilizers from Guyanese industry waste.

Poultry manure :
Poultry farming is highly developed in French Guiana, so it is relatively easy to obtain large quantities of manure from producers. This manure will be mixed with the topsoil used in the nursery to allow a better vegetative start of the trees, they will be more robust during their implantation on the mine, which will increase their survival rate.




Wood ash :
The wood ash, of which agronomic interest is well known, is recovered from the Kourou thermal power plant. These ashes can be used both as an amendment to improve the soil structure, and as a fertilizer to increase fertility. They will be kept away from the rain before being added to the soil mix at the nursery level.



Bagasse :
Bagasse, a fibrous residue obtained after processing sugar cane, has a very important absorbing power. Although it is not yet used on the mine, experiments to combat soil erosion are planned. The bagasse is recoverable from the Saint-Maurice rum factory located in Saint Laurent du Maroni.



Sewage treatment plant sludge :
Sludge from sewage treatment plants is known for its agronomic interest. And seem adapted to our problem, indeed their high C/N ratio, their high concentration in orgnanic matter and their slow decomposition make it an organic input of choice for the fertilization of the trees. This is why we approached the Town Hall and the Kourou sewage treatment plant to obtain the authorization to import 50m3 of ca material on the mine of Saint-Elie to carry out various tests, particularly in the development of our soil mix used to make the Seed bombs.


Fishing waste :
Waste resulting from the processing of Guyanese fishery products is of agronomic interest. It can be fertilized by soaking fish waste in water for a few months. This liquid fertilizer can then be applied by sprinkling on the plants produced in the nursery.



Burlap bags :
Rather than bringing materials from the other side of the world, we came up with the idea of using burlap bags to fight erosion, our biggest enemy in the Guyanese climate. It turned out that a coffee roasting company in Guyana wanted to get rid of a substantial amount of these bags, which they considered to be worthless waste.

Fumier de volaille

Cendres de bois


Déchet poisson