High ore loss and dilution which are mainly caused by direct contact between blasted ore and caved rock generally exist in the process of exploiting inclined medium thick ore bodies using the sublevel caving method An improved diversion drawing technique was proposed with the aim of controlling ore loss and dilution by changing the flow path and velocity of caved
It used a ladder connected to the top Their caving companion Charles Petit Didier helped improve the design in 1942 so it could be used in longer lengths using guy ropes Irish cavers Coleman and Dunnington attempted to make a segmented scaling ladder in 1943 but it collapsed during its first use underground in Pollnagollum
Sublevel caving SLC is a mass mining method having high productivity and high safety However this method often causes a considerable amount of permanent ore loss Interestingly all lost ores are buried in the broken waste rocks that come mostly from the caved hanging wall and partly from the ore body in which ore and waste rock are
Sublevel caving is a mining method to realize ground pressure management by caving surrounding rock With the caving of ore the surrounding rock is forced or naturally to fill the goaf to control and manage the ground pressure [1 2 3 4] Sublevel caving is a large scale mining method with low cost and high efficiency which is widely used in metal mines
A segmented caving method and physical model technology applied in the field of underground mining can solve problems such as understanding abstraction and teaching demonstration difficulties Inactive Publication Date 2018 02 02 NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY View PDF 6 Cites 0 Cited by Summary;
The invention provides a dynamic segmented mining and caving technique for strike long wall full mechanized caving mining of a high dipping thick coal seam The technique comprises the steps that two roadways are excavated in the high dipping thick coal seam to serve as a transportation roadway and an air return roadway correspondingly a strike long wall full mechanized caving
In the caving method the primary focus of design revolves around draw point spacing and ore draw layout while for the open stope and fill mining methods the central emphasis lies in the design of stope span 1 50 ; d multi segmented three dimensional ore drawing model 1 100 [123 124 125 126] Figure 8
The sublevel caving SLC method has been widely used in underground mines across the world especially in large and medium sized underground metal mines because of its advantages in terms of safety mechanisation capacity low operating costs and flexibility in dealing with the ground pressure 1 2
However in the segmented caving method of metal mining the presence of sinkholes in the caving zone makes it difficult to determine this parameter Furthermore the maximum settlement value on the ground surface is generally located within the sinkhole which significantly affects the ground deformation in the nearby area
A segmented caving method and target planning technology which is applied in the field of mining plan optimization of the non pillar segmented caving method can solve problems such as single consideration of the mining sequence of ore blocks insufficient number of iterations and inability to connect so as to avoid difficulties in rational connection Strong executable and long
A segmented caving method without pillars which is applied in ground mining earth drilling underground mining etc can solve the problems of increasing mine construction investment intensity large ore dilution and low mining intensity so as to eliminate blasting The effect of partition wall accident increasing the amount of ore mined and improving the ore recovery rate
The longwall top coal caving LTCC is a widely used method for producing thick coal seams This method is applied in two different ways in steeply inclined thick coal seams by forming a longwall at the horizontal thickness of the seam and the slope of the seam In the LTCC method the top coal loss is generally expressed as the coals remaining
How Segmented Caching works When an end user makes a Range request for a resource with Segmented Caching enabled and a cache miss occurs that is at least part of the range is not cached Fastly will make the appropriate Range requests back to origin Segmented Caching will then ensure only the specific portions of the resource that have been requested by
This project overcame the difficulty of the traditional segmented caving method where the residual amount in the lower wall increases sharply with the increase of mining site structural parameters It has been successfully promoted and applied in more than 10 mining enterprises in the Anshan Benxi Area Shougang Group Baowu Group CICC Group
These segmented worms earthworm are often abundant in caves groundwaters and sediments living in soil They ingest eat mud and extract nutrients from it Allolobophora chlorotica is responsible for worm casts in Otter Hole Some are to be found deep in caves but all those found in caves also live in surface soils
Segmented R （segmented regression model） （breakpoint ） 。Segmented
A segmented caving method without pillars which is applied in ground mining earth drilling underground mining etc can solve the problems of increasing mine construction investment intensity large ore dilution and low mining intensity so as to eliminate blasting Partition wall accident increase the amount of ore mined and improve the effect of ore recovery rate
A segmented caving method and physical model technology applied in the field of underground mining can solve problems such as understanding abstraction and teaching demonstration difficulties Free Trial Physical model used for demonstrating non pillar sublevel caving
The invention provides a horizontally segmented high yield roadway layout for sharply inclined coal bed and a coal caving mode According to the method the roadway layout the coal caving mode and top coal high pressure water infusion are optimized to improve the mining rate of top coal Fully mechanized caving faces of horizontal sections are arranged along the horizontal
To improve ore recovery ratio and the quality of medium length hole blasting in non pillar sublevel caving method this study first investigated the effects of brow line failure on rock movement and ore recovery indexes based on rock blasting fragmentation mechanisms the granular dynamics theory and ore drawing theory Subsequently control strategies to enhance blasting quality
